need a book recommendation

BostonGayGal

My little sister is dating a loser. He leeches, gets into minor trouble with the law, gets her kicked out of her apartment, wastes money on cigarettes and pot, and is generally lazy and stupid. I suspect she stays with him because it makes her feel more capable and she has a bit of a broken bird syndrome. I don't *think* he abuses her. 

She knows how I feel, and we manage a strong relationship despite our differing opinions about him. I am buying her holiday presents, and if there were a book that might be helpful to her, I will add it to the gift. No biggie if there isn't a title that comes to mind as being on point, but I have seen you guys mentions certain books and wondered whether you might know of a good one.