Home situation

Hi, so I live in a dv household (my little sister is the abuser) and I need help on how to get her taken away from the house. I know ring the police or social services but my mum will hate me so I don’t know what to do. I can’t live with her anymore, she is a vile child and I hate her so much, she needs to leave or I will move out but I’m only 17 so it’s hard.