It is the best time to pack your things and live on your own ... you can always help her even if you are out of your house (or, ship her out of the country to your dad, so you will be alone in your house)... I hope you will be successful in your love relationship; being a battered child, I mean, emotionally, you are carrying a heavy load of hurts and deep anger ... and it will always be there, creating havoc unless processed by a professional therapist.