You don't have to be happy for her at all.
This has triggered some really strong feelings in you. From past hurts. You are feeling your own pain, your own history.
This isn't about your T. You just have lots of hurt, and it is easily brought to the foreground again by lots of things, like this thing. T didn't exclude you... she is just keeping her personal life and her professional life separate, because that is what she is supposed to do.
What these feelings tell you is not that T excluded you, but you have been hurt by many exclusions in the past. T did not exclude you, but you feel the pain because you have experienced a lot of exclusion. T getting married and not telling you was not an exclusion of you. She was doing what she is expected to do.
Take care of yourself. Do something nice for yourself. Make sure you include YOU!