I would definateley try to keep in touch with her if you can and are ok about it.i
who's to say what is up with her, but I would make "sideways" efforts to see if her behaviour is causing others concern, over her own and others safety
From what you have said so far, her actions and thinking does seem to have veered away and are counter to , the realities that you are part of

By "sideways" I mean that, if you could make contact with a mutual friend or one of her own friends or relatives first ,BEFORE, you take any other action, would be the first thing that I could suggest anyway.

if this can start the ball rolling then thats great,, as it does sound that your friend might benefit from some listening to from somebody qualified to , yes, a professional

If you care about her then,you should be able to progress , but be patient.

keep trying.. try the chat room?

look after yourself though, first of all.!

11.30pm , edinburgh