OP here. It got so bad, I had to block her on Facebook. She was a friend of a friend from our group.
She just kept sending me messages on courses on "Dianetics". I tried to explain to her, that
1. Thanks, but no. I'm glad it worked for you, but I don't think it's for me (I did try to be polite as possible.)
2. I've been seeing my therapist, for over 3 years now, and I believe I've made some progress in my recovery.
Apparently, over WhatsApp-she was not part of our group chat, I wasn't the only one she did this to.
We had to tell our friend-who introduced New Girl to our group, we don't want her around anymore.
She makes us feel very uncomfortable, with her views and beliefs.
Friend to New Girl-decided to end their friendship, I think she saw New Girl as "unhinged".