Is she going to develop Stockholm syndrome or something? I don't think I like that idea... falling in love with the person who killed your parents? I wouldn't. I'd do my damndest to kill him. But It's whatev. It's your story, and you do whatever you want with it. It does sound interesting, and I'll read it only just to see how it progresses. I think you have a really good plot going on. 

ooh, i love this.

it soundsvery promising.. please update soon