I need real help risky thing to do but might be worth it?

so lately me and my girlfriend has been sexually active and we been together for 1 year now and her dad caught us and now i cant see her anymore hes the biggest dick in the world a person you wouldn't ever . see so negative is him. we were thinking about me leaving a bruse on her and telling the cops and he would go to jail for a very long time and he would go to jail for brewing ethanol without a license he use to like me but cause shes a teenager now shes prob about to get beat by her dad that hit her all her life so help please 10 Pt's for the best answer!! btw she has no mom