I've had many, many productive conversations with my current therapist that started out by talking about how hard it was to bring something up, rather than by bringing up the difficult topic from the outset. Hell, I've had really good sessions that were almost entirely about how difficult it was for me to say anything, Maybe try talking about feeling like you're stuck, and your sense that she also thinks things are stagnant, and what that's like for you? It might ultimately get easier to talk about the things you haven't been able to say yet (I'm hesitant to say "holding back," since sometimes I think that obscures the reality that it's just not possible or realistic all the time to cut right to the most vulnerable topics) if you take a less direct route.