Good Girl is a Street Fighter

Originally called Angel by Day Devil by Night was about a teenage girl who's Mom had died and Dad well... I'll get to that later. One day she fights one of her classmates in a fighting championship and the boy discovers her true identity and becomes interested in her and starts following her. When he follows her to her Dad's house because she is out to kill him because he kidnapped her sister he ends up saving them. Another night the police come to try to end the illegal fighting and sends the girl out to California to leave her sister with her grandparents but the boy followers her. She successfully managed to leave her grandparents but the boy soon catches on heads home. I was almost done with book. Sadly, I ran out of ideas and foolishly deleted it. Update 11/14/2020: I somehow found a copy of this so I may upload it again if I can.