The two satisfying terminations I have had were exactly like that, talking about highlights of therapy, things I have learned, and ways my life is different now. Reminiscing is exactly the right word. It seems odd to me that your T isn't picking up on that as a cue that you're ready to be done. You know better than anybody when you're ready to fly from the nest, so why isn't she joyfully celebrating that with you? It seems a bit... deflating.