TL;DR

Sarah’s wish is to be beautiful. One day she comes across a robot called Eleanor in a junkyard, who will grant her wish to be beautiful, as long as she wears her heart-shaped pendant. Every day different body parts seem to become more beautiful, until one day she trips at school and her pendant falls off. She realizes that Eleanor had been doing surgery on her every night, and the pendant was creating an illusion. Sarah is left as a pile of scraps to watch as Eleanor as she runs away in her old body. She then realizes she was beautiful this whole time.

Full Summary

When Sarah looked at herself in the mirror, she found herself to be 'flat and fat'. While other girls had curvy 'hourglass-like' figures, Sarah compared herself to the Mrs. Mix-and-Match doll she had as a kid. Unlike Mrs. Mix-and-Match, though, she didn't have her Mr. Mix-and-Match. She has a crush on a boy at school, but only the Beautifuls, a group of basic popular girls could get his attention. Sarah however, finds her mother naturally pretty, wondering how it skipped a generation. Her mother's concern for her grows as she becomes aware of Sarah's diet - she obsesses over eating a lot of low-calorie foods like yogurts instead of full-meals. On the bus to school, she watches make-up tutorials on YouTube.

The Beautifuls strutted down the school hall like supermodels while everybody watched. Each girl was beautiful in a different way - Lydia had blonde hair, blue eyes and a rosy complexion, Jillian had fiery red hair and catlike green eyes, Tabitha had chocolate-brown eyes and lustrous black hair and Emma had chestnut hair and doe-like brown eyes. Abby, Sarah's friend since kindergarten doesn't approve of them, while Sarah thinks they look perfect. At lunch, Sarah asks her what she'd do if she had a million dollars. She says she'd take a trip to Paris with her family, while Sarah would get skin treatment and professional make-overs. This causes them both to get into an argument - Abby claims that Sarah has changed for the worse and Sarah says it's because Abby hasn't grown up. After school, she decides to go to the beauty supply store to get some peroxide bleach and 'Pure Platinum' hair dye. When she goes to dye her hair herself without her mother's permission, she screams when she finds out it has gone a sewage green colour. When her mother finds out, it doesn't impress her, but she helps to get her hair back to its original colour.

At school she sits at the opposite end of the table with the Beautifuls, but feels invisible. When she heads with her tray to the trash can, she bumps into her crush, Mason Blair, getting her salad all over his crisp white shirt. He gets annoyed, telling her to watch where she is going. In solitude, she decides to walk home instead of taking the bus. She walks past a wrecking yard full of destroyed corpses of cars. She walks over to the car nearest to the fence, and notices a white metallic arm coming out of the trunk. When she pries the trunk open she discovers a tall doll robot with green eyes, lipstick, pink circular cheeks and red hair pulled up into two pigtails. Its body was sleek and silver with tiny waist and long neck. Sarah finds her beautiful like the supermodels in her room's posters, so she decides to bring her home and clean it up. She finds an ON button and switches it on, making the robot's body move, and turn to Sarah to talk to her. The robot introduces herself as Eleanor, and thanks Sarah for saving her, asking what she can do in return. Of course, Sarah wishes to be beautiful, so she tells Eleanor with no belief that she could do anything for her.

The next afternoon, Eleanor hands Sarah a silver heart-shaped necklace and tells her never to take it off. She tells her it will make her a little more beautiful every day. Sarah doesn't believe it, but chooses to wear the pendant anyway. Additionally, Eleanor tells Sarah that for it to work, she has to sing her to sleep. Before Sarah's mom was even home from work, Sarah was put to sleep by Eleanor's lullaby. When she wakes up, she notices that both of her arms are slimmer, more toned and glowing. Her fingers are longer and painted a soft pink. When Sarah hugs Eleanor and asks her if the same thing will happen every night, Eleanor stands idly with no response. Sarah eats a bulkier breakfast with her mother, who compliments her nails. In the bathroom at school, Jillian, one of the Beautifuls, also compliments the nail polish, making Sarah pleased that she is finally being noticed. After school, Sarah requests that Eleanor would sing her to sleep later in the evening. She becomes disappointed, but accepts. Sarah wakes up the next morning and finds her legs to be longer and smooth with pink painted toenails. She decides to wear a dress to school, and her mother asks her if there's somebody she's dressing up nicely for. Sarah says it's for herself. At school, Sarah passes Abby in the hall and starts to miss her. She goes up to her and apologises for being mean. Abby notices that Sarah is slightly taller.

The next day, Sarah wakes up to find her body more curvy and feminine, and she asks her mother if they can go shopping for new bras at the weekend. At school, she could feel boys staring at her through the halls. Once again, she bumps into Mason Blair, but this time he smiles at her and they introduce each other. Back at home, Sarah hugs Eleanor and feels a wave of paranoia. She pushes the fear away because she is her friend. Sarah requests another appearance change as some guys find her pretty, but from society's standards she's far from pretty. Therefore, hesitantly, she decides she wants her face changed. When she wakes up, she looks in the mirror to a good shock. At school, she feels everybody looking at her - she sits with the Beautifuls and they invite her to talk. Sarah lies about her clothes, her trips to New York and her parent's jobs. Afterwards, Abby catches up with her and asks her why they were interviewing her. Sarah defends them by saying they're cool. They get into another argument which ends with Abby storming off down the hall. Then, Mason Blair approaches and asks her if she wants an ice cream at the Brown Cow. They eat ice cream, and decide to go on a date to the cinema at the weekend. When she gets home she tells Eleanor all about her amazing day.

On Saturday, Sarah's mom drops her for her date at the Pizza Palazzo with Mason. On Sunday, Sarah asks her mom again to drop her to the mall to see her friends. Sarah's mom doesn't like the sound of her new friends but says she likes Abby because she is kind. At the mall with the Beautifuls, she doesn't have enough money to buy anything, but doesn't tell them in case they would judge her. They annoy a lady in a store and run away mocking her, which Sarah finds to be a tad hard on her. That night, she has a nightmare about a date with Mason at the cinema, who turns into Eleanor with a mouth of sharp teeth. She wakes up to find Eleanor staring over her bed with wide staring eyes. Sarah commands Eleanor to stand by the door to be more comfortable. She knows something is wrong, but she doesn't know what. In the queue at the school cafeteria, the Beautifuls insult Abby behind her back, making Sarah feel a little uncomfortable. She then trips up on something and falls on her back. People laugh but the voices start to feel distant. She hears loud metallic clashing and clanging sounds as her body shakes uncontrollably. Then, the girls' laughter turned to screams. The necklace that Eleanor instructed Sarah never to take off, had fallen off. As the Beautifuls run away, Abby holds out a hand as Sarah's lower body turns to scrapped pieces of metal. She gets up and tells Abby that she is a good friend.

As she decides to run home, she sees people look at her in fear. Her joints get stiffer and it gets harder to run. When she gets to her room, Eleanor is gone. She looks around the house and comes across her in the garage, where she sees bloody black bags with neatly amputated legs and arms and Sarah's old head. She looks to Eleanor, who presses a heart-shaped button below her neck and turns into the old Sarah, who the new Sarah realises wasn't so ugly after all. Eleanor, with Sarah's old body, skips into the sunset as the new Sarah loses all feeling, becoming nothing but a pile of scrap metal in her garage.