What to do if u're a 19 year old girl being verbally and emotionally abused alongwith neglect?

There is a girl whose age is 19. Her family has always been very twisted and now that she has started being affected by them and starting to get violent to defend herself , they called the police on her. The police came and only listened to their parents. Now the child wants to do something to ensure her safety as the parents are threatening to file a written case and whatnot just to make her suffer. About the family : 1. The mother has been depressed for years. and had even poisoned the child once when the child was very young. 2. She had always beaten the child for even the smallest of things very badly. 3. She had completely stopped giving the child food every now and then to the point that the child now , over the years has developed an eating disorder and depression. The child had to roam outside everyday after her class for a few hours just to avoid being much with the mother and because sometimes the mother wouldn't let her in. 4. Her father , didn't help much since she was 14 as he didn't like her hobbies of listening to music and drawing during the free time. 5. Her brother is also worse. They stopped talking and he has always been hostile to her only getting involved during the family fights to beat her.