I can tell you one thing right now I don't share my T with anybody! Yeah, first come first serve, you were there first, she's gotta go. You need this relationship with your T and she needs to find another T. It is that simple.
I know a couple of people who used to see my T and I wont discuss her with them. That would be like sibling rivalry x 100,000,000! I know she is a newbie to the world of therapy (Anyone who thinks it rocks has to be a newbie) But she is way out of line with her comments and I'd let her know it, but seriously you are right...tell your T this won't work. He should understand and refer her to someone else far far away.
I am sorry she did that to you. I can imagine how upset you must be and you have every right to be.
JM