I am so sorry this ended this way. But from the way you are processing this, you and she did some awesome work.. and you did the hard stuff with her... what a beautiful thing to add to your gratitude list. If you do call, I hope it's to tell her how much she helped you. And that she will live in your life forever because of the impact she had on your healing work....
I still her my favorite T's voice in my head, or see her smile.. or see her get quite when I was sharing the hard stuff... I was the one that ended the sessions, and SHE was hurt... I ended it because I needed more than what we were doing... I feel I made a mess telling her goodbye... but I did write her letters for a long time... maybe you can email her once in awhile... stay in touch...
And it's so hard to not feel betrayed... to some degree, but she may not have known last week when she saw you... I hate it that it doesn't get to be a two way street with our T's , but I also understand why. And I know it was very very hard for her to tell you she was leaving... She is still very invested in you... let her know how you are doing if you have some way to contact her in the future....
You are feeling what needs to be felt, that is your perfect goodbye to her... doing the things she taught you to do... and like has been said, you can do the grief work with the new T.... she would not have recommended someone she didn't think would be all you need... this is so hard.... but you learned a lot from this woman. Doesn't take away the feelings... I wonder if she is setting home crying wondering how you are???