Can you write your t a note asking her to ask for you during therapy. I sometimes have that happen where someone has wanted to talk and when session comes someone with better communication skills dominates the session. I do understand that they also need to talk and just don't think about what the others want. Also if you talk to the alter that is at most of the sessions and tell her you need time with your t. I am sure she will understand and give you room to talk. Most times if one of my alters dominates the session it is because they were unaware of someone else wanting to talk.