OK for any one who didn't know sister location was released and this has spoilers for the game

So the " Ghost girl as markiplier described I think it is mangled as people say she could of done the bite of 87 and it described her the animatronic said doing something to this little girl which had screaming involved and after that she was not allowed on any more and got taken apart just like how the bite of 87 happened so it could be mangled voice I have not looked into this it is just a guess.