Hi Amy,
I can understand a bit. I was in a dbt group and it was often disorganized and would go off topic. Check ins were sometimes dismissed for certain people and she would end up focusing too much on one person. I think she did the best she can. In that situation, I realized another person also felt "left out", and we both spoke up finally about how we felt. It's hard to do, but the only way you can get the help you need is to speak up and say how you are feeling. Possibly, put in a way that doesn't sound like you are dismissing the help that she/he is offering, but that you feel you need more help and would really appreciate it if the therapist of your group would go back to doing check ins? I hope this helped. I had also walked out of a doctors appt. once, because I couldn't stand the anxiety of waiting in a room full of men. I explained this to the secretary there, and they did understand. Sometimes it is very hard to say what you need, but that is also sometimes the only way to get the help you deserve.