WalkFree - I'm sure that others who have more experience with therapy will have some good ideas for you, but I did want to offer one thought. Therapists are really good at compartmentalizing from one situation to another. What I mean is, that your therapist probably doesn't want to presume anything about what you have and haven't shared with your husband. So, things that come up when all three of you are in the room are new in the context of a session with all three of you. It is a new base to work from. She might not want to bring up issues from when it was just the two of you unless you offer them up or directly give her the ok to do so.

My T does this for me because I see her for individual and couples. She never brings things from my individual session in a couples session with out me offering it up. (she may indirectly prompt an idea, but leaves it up to me to fully discuss with my husband in the room). From the sounds of your post you aren't specifically there to work on your marriage, but it may just be that she doesn't want to presume anything with out your direction.

Just an idea.