1.) I believe that the person who rants about hearing the elevator is just a (mostly) normal hex maniac girl. There is no evidence to support that she IS the ghost girl again. :/
2.) I think she will have a bigger role in the 3rd version, or whatever it will be. XD
3.) Game Freak needs to tie up that "Going for help" thing on the lumiose station. It's...so mysterious. XD