I know my girlfriend's dad physically abuses her, what can I do?

Anonymous
My girlfriend is living with her dad (restraining order from mom, she's an abusive crazy too) and he's an alcoholic and has violent outbursts about once a week. She's already been through foster care at an earlier point in her life and absolutely hated it so she doesn't want to go to the authorities but I can tell it's been getting a lot worse recently. I left in August to go to college and she still has about another year and half at home before she can move out and I honestly don't know if she's gonna make it. I've talked with her about it a lot but she insists that she has nowhere to go, and that living with her dad is the only option. What can I do to help her?
Updates
+1 y
I know this sounds ridiculous, but $ is factoring a lot into her thinking. She has amazing grades in school and could get into college anywhere (looking at Stanford, Harvard, Tufts, UCLA, MIT) but she know her dad won't pay for college if she moves out
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+1 y
I was kind of oblivious ever since I've been dating her. She always seemed to get broken bones and she'd just say she tripped down the stairs or slipped at the pool. I don't know what to tell her anymore, I can't say everythings going to be OK and mean it
I know my girlfriend's dad physically abuses her, what can I do?
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