I would like to tell you that, whatever done by your sister is under influence of Menatal disorder. so as per her act she did not liable for any kind of Violation of Law. if she has no control over herself, even to judge what is right and what is wrong if is unable to decide or find out the ratio of right and wrong, then how she would held liable for violation of Law. She is absolutely Inocent, because whatever done by her is under Menatl Disorder.
So as per my point of View she should not be charged.