The best advice is to have your friend abstain for ANY relationships till she works on herself. Rebuild her own foundation. Be kind to herself. Be supportive of herself. Many women have the white knight syndrome and expect that a man will come along and make it all better. Drag us out of our dungeon and prop us onto a pillow in a castle and we all live happily ever after. Unfortunatly many men are no better at rescueing you than they are at getting themselves out of their own dungeons. You cannot have a healthy stable relationship with anyone else until you have one with yourself. We soon find this prince wants us to scrub that castle and filet that dragon he slayed, while raising the children and working full time while he goes out to the local pub with the local boys.

That being said, some of the clues about abusive men are that they want to separate you from friends or family. They want you to be wholely devoted to them. They are hyper critical of things that dont make sense. calling a skinny girl plump or telling a successful woman that she is a failure. Telling a woman who is a good driver that she scares him. If your friend is solid in herself she will know these things are not true. Nipping these things in the bud very early is the key. To speak up and stand your ground to say "you cant speak to people like that, its hurtful, please apologize" Will usually put this person on notice that this girl isnt going to be easy.

There are buckets of good books on the market, and many good remedies, but I would hope that your friend takes time to repair herself, and perhaps speak to someone professionally about putting her life back together. Nothing is sexier to a stable man than a woman with good self confidence. Nothing is prettier than a woman who is secure with who and how she is. Stable men see a woman with a good foundation and simply find them irresistable. Unstable men see a woman with an unstable foundation and the same applies. Have your friend get in touch with what SHE likes. is it funny movies? The color blue? meatloaf and not fish? As she gets to know herself she will find her foundation begins to cement.