What do I do with her?

I think you need to be stern with her. Tell her exactly how you feel about these situations. And you are right, he isnt going to change. He will never quit abusing her, whether physical or verbal. If you truly have feelings for her and care for her then you need to take a stand. Even if it means telling her how you feel and walking away. She has to be the one to realize that he is no good for her. You can only do so much.........