I think you have to determine for yourself what a reasonable amount of time is for her to get back to you.

If you're in true crisis, and your T drops the ball - find somebody else, even a friend - anybody.

Trust is important in therapy. If you feel you can't trust her, go out the door the same way you came in! (serious - I've had some pretty lame experiences myself)

There are dedicated T's and run of the mill T's - you want the dedicated kind - trust me. (don't we all?)