Usually an epic internal battle would refer to some kind of dilemma the girl is having. Without reading the story, I can't say for sure, but I think she sympathizes with the thief. She probably thinks that, if she was in the thief's position, she might do the same thing. So it would be difficult for her to try to stop someone that she doesn't think did anything really wrong. Once again, without reading it, it's impossible to be certain, but I hope this helps.