I hear you---
Did your T talk to you about your friend's behavior?
I know how hard it is to think that you can't see or talk to a friend. Maybe, though, your T has a point. Perhaps give it a week or so of not calling her. Maybe it's not the healthiest thing to be contacting her right now. It is doing harm to you and your system.
Perhaps she is going thru some of her own stuff and just can't be there for you. It would be nice if she could tell you why she is unavailable right now--but maybe she can't.

You could take this time to cultivate new relationships with classmates. Just to do things with.
RL friendships are hard.
w_i