I would say thank you but decline. I have severe anxiety and have also been diagnosed with advoidant personality disorder among other things but made myself go to groups. I have been in tons of group so I know for a fact that most people when they first start a group are anxious. Some people take forever to start talking. Some people take forever to be able to feel emotions. We would always get new people and usually they would say how anxious they were feeling.

I still think it was nice of her to offer though.