as usual, Irulan is right on the mark, IMO.

If it truly is abuse, get the authorities involved. If it's simply objectionable and poor, the liklihood of your advice being welcome is very low. Either way, there's a good chance the relationship could be ended....so be prepared for that, if you can!

Good luck!

Remember, it's her karma. Not yours.

Live mindfully and peacefully, the light is within you.

Namaste,
~T~