Therapy

So my Drama friends and i have begun an activity we like to call Therapy. It's where we get together and vent, dance, sing, eat, and play improv. games. The point of it is to get us to feel better, and to prove to ourselves that teenagers can have a good time without throwing in a totally unimaginative movie. It's fun, it's good, and the best thing ever is that it was exclusive. That sounds bad of me to say, but sometimes it's hard to be yourself in front of people you don't trust...
With that being said last Therapy (Friday) was an absolute disaster. Because one among our number obviously wasn't filled in on the whole "exclusive" part of therapy, so of course she invites another girl...another girl who quite frankly might have just destroyed therapy. When we had our vent session she took the entire time to vent her own problems, which by the way, she's vented to us everyday since the beginning of the semester, so of course we already knew about everything she vented, and had already given her our advice. With that none of the rest of us had any time to vent...which was why we had therapy in the first place, so EVERYONE could vent. Then the same girl made sure the focus was on her the entire time during therapy, and didn't let us give anyone else the attention.
Now she's talking about next therapy, and how we should watch a movie (which goes against therapy), and she'll probably start planning therapy sessions thus forcing herself into the eternal therapy circle. The worst part is that she practically invited herself to therapy, and now she is taking over.
I might need to form a new therapy group...that remains forever exclusive.