*UPDATE* Possible Molestation... HELP!!

Glow wouldn’t let me update the original post but first I would like to say thank all of you for advice on what I should do. I decided to first talk to my aunt. Now I didn’t tell her what was going on but I did ask if my niece had been over there lately. She told me that she stopped her from coming to her house about 3 weeks ago but my niece would still come knock on her door every other day. That made me a little worried so I asked her why she stopped her from coming over and she explained to me that about a month ago her psychiatrist took her off her medicine completely and she started having inappropriate thoughts and developing feelings for my niece. She also said that she’s never touched her and she cut communication to avoid it but by my niece constantly showing up she’s making it difficult and even has my aunt considering self harm just so she can avoid a repeat of the past. Since my niece spent the night with me I went home and had a serious conversation with her and she admitted to making this up because she was upset about not being able to go over there. With this girls history I honestly can no longer trust her and believe she needs serious help so I’m going to talk to my brother and his wife about having her committed because this has gone on for entirely too long with no sign of change near.