Oh, I like your idea, too! I haven't been able to think of any other ideas, so I think we could stick to yours, if you'd like. All these ideas have the potential for darkness, angst, drama, and all that. How long would you like for it to take for her to break free? It doesn't have to be 17 years, where the movie started - a little less is fine.
Did you want to play in character journals? I'll probably just use this one, even though its kind of a generic Repo journal. There are probably not many Marni icons out there, thanks to her limited screen time, so I think you could always choose a different PB, if you'd like. Whatever!