((((((FallenAngel)))))
While you may not feel comfortable yet (and I'm not suggesting you do anything you are not comfortable with) but it is really important for you to let both of your T that you are seeing each other. Did your other T know that you were looking into this group? If she did you could bring it up by saying that you didn't get into the group because it was full, but that this other T suggested you work with her specifically on the SI. It will be good for them to know about each other. They may ask you to sign consent for them to talk to each other. That is what I did when I saw my pdoc on campus and my T off campus. That way when things got worse (they did for me, not suggesting they will for you) they are able to talk to each other to make sure they are on the same page about your treatment, (for example who you contact when).

I also know that you are interested in psych and (not that you have to think or worry about it) but there are regulations that the APA has for T working with patients who are seeing other T so that things don't get too complicated.

I wish you luck with your situation. And am sorry you were not able to get into the group. I hope you can get in next semester.