During one of Abby and Will's breakup periods, someone suggested that Abby should maybe try and find herself a girl to settle down with. An innocent comment with no rude intentions. But then, everything changed when the fire nation attacked.
The screenshot to the left shows that Abby is straight. Not only is she straight, but she is completely against the idea of gay relationships, saying that being gay is a choice and that gays will burn in hell.
Since then, more information has been dug up about her opinions on the LGBT community.
The screenshot to the right shows than when she was in her Bone Daddy phase, she was accepting to the idea that members of the LGBT community were people. She was much more accepting. But as you could see above, when she entered her next phase, she was suddenly much more unaccepting of the idea of the gay community.