It sounds like you're in a tough situation. I think if she's serious about working things out, she should seek out individual counseling (find a local counselor here) and you both may benefit from couples counseling. But most importantly, make sure to be supportive (not pushy or judgmental) of whatever she decides and continue to reiterate to her how much you love her. With the proper professional help, she (and you) will be able to overcome her past and begin building for a better future.

Good luck!