I think there is this misconception in that you can "Cure" these people you can not. Its who they are its not because they where dropped on their head its who they are.
They can pretend to understand and play the role that society expects of them but its all an orchestrated act. If she was a person with common sense and of good nature she would not go out and kill a little girl just because, that right there is a clue.
Its one thing to kill someone in accident and another because of anger but just to do it because your curious what it would feel like. There is no cure from this only two choices separate here from the rest of society in prison or kill her.
Dont be fooled by appearances because she just looks like some confused goth kid from the suburbs we should all pity her. Shes a predator so treat her as such...