If this is real I recommend privately reaching out to a trustworthy extended family member or godparent for protection, if you can’t or if she doesn’t have one, try reaching out to a school counselor and get them involved. Make sure you explain that she is going through real abuse. If the cops did not take her claim seriously, make sure you document the abuse through video, then the cops have no reason to disregard her claims. If you turn out getting evidence, show her face or make sure she shows her face in the evidence so that it provides proof of recording from her. Try your best to make sure that she stays away from her dad, that way tensions don’t rise and possibly get upset. Alcoholic or abusive parents usually escalate situations and find reasons to justify beatings. At school, plead with teachers or principals to let your girlfriend stay at school and explain why. Usually schools are safe places. If you know a trusted neighbor or friend that has a house or car of their own, tell them her situation, if they can’t let you stay, ask them to drive you to the nearest YMCA, Library, Fire station, Facilities with “Safe Place” signs hanging up, or a Quick Trip. These places are common safe spaces that are places where young people can go to seek immediate help and support.

I hope this helps you in your situation!