I understand you feel your boundaries were crossed and that is valid and understandable. However, I also don't think your T did anything wrong. Unless you previously stated something along the lines of no celebrations. I actually think what your T did was appropriate. I agree with Waterbear that your T was modeling what healthy relationships look like. I don't think your pain is coming from your T's actions, but rather your family's lack of actions. And I think you might be placing the hurt and blame on your T because she's safer to be mad at than your family.

***I could be wrong on all of this. It's just speculation and hypothesis

Definitely talk to your T about this. I bet a good conversation/processing will come from it.