Because it is so unique, she will probably need some time to learn all the ins and outs of how it works. Give her a little time. It's hard to hit the ground running in such a unique situation. Does anyone in the group feel empathy towards her? When I read what you wrote, I felt what it would be like to be in her shoes, and I think it would be scary and tough! I can also understand how unsettling it must be to have a newcomer T in the group's midst.

That could be a big reason they chose her. It wouldn't necessarily be the best to have all the Ts be too similar. Different perspectives and approaches and personality types could help in the variety of what goes on in the therapy and who you have to identify with or play off against. I know it can feel disenfranchising that your group was given the opportunity to speak with this T before she was hired, did not recommend her, and yet she was hired anyway. But it could be that the reason she was asked to speak with the group beforehand was so that the staff could see how you all interacted with her and she with you. They may have liked what they saw.

What did she say when you told her this? It seems like it would have been a good opportunity for her to share her background and training with you so you can get some reassurance.

What boundaries would you like her to set?