Hm! Seems odd that she doesn't get that... she knows you're on the dissociative spectrum, right? It is my experience that many of us have a hard time grasping emotional stuff. That's across the board for people in therapy. Or we may be able to reach one emotion, but not another, or have one in particular that we can't access (like anger, for me). One signal my T is picking up on is that when I get disconnected, and irritated about it, I start playing with one of the toys in the basket (she has several of those stretchy balls or light up balls. I always pick up the light up ball when agitated). What clues might you be able to give T that you are disconnected?
I think it can be hard to even give a name to our emotions. Like we weren't schooled in these things, you know? So that might be a place to start. Like I could access sarcasm, or sardonic humor, but not "anger". Old T had to spell it out for me.