Kiya, just a quick response to this. I think your letter is rather lengthy and you could achieve more if you make your point clearly and very early on, i.e., that you (and the rest of the group) are not happy with one person dominating the group sessions. Also, I think a better approach would be to raise this directly with the group therapist, either by yourself or as a group. It is her job to be in charge of the group dynamic and at present most people are not happy with that. It is kind of sad that she doesn't notice this but as things stand you (or the group, if many people are unhappy) need to give her feedback.