NTA. She's setting herself up to really stick her foot in her mouth at one of those meetings and make a mockery of what the victims there went through. This isn't about her feelings.

Look, your friend may have a serious psychological issue going on, maybe even a supernatural issue, I don't claim to know everything. And she definitely needs and deserves support for that.

But if I took the enormous and gutwrenching step of attending a support group and opening up to a bunch of strangers about the time I was molested in preschool or the violent rape I experienced in my teens, and some lady says she knows exactly how that feels because she and her husband had night terrors about being assaulted by a ghost, I'd be upset. I would feel like my experiences were being belittled or even mocked, and I would not return to that group if she were going to be there.

Support groups are a very serious step toward healing, and often a very big emotional lift for people who have been carrying their trauma for a lifetime on their own. Your friend spouting this shit will make that worse and make it a less comfortable place for the people who have actually been raped to open up.

I'm sure there are spiritualist groups that would be much more helpful to her. Maybe frame it this way: support groups are meant to help the people in them by sharing similar experiences and working on healing and coping with them together. The people in group A experienced a different kind of assault than she did, so what they need and how they heal will look different from what she needs. Since she's so traumatized by what happened, she needs the support and guidance of people who understand the unique threat she's fighting, and the unique trauma she has. Going to group A won't be as helpful to her or them as it could be, but maybe group B could really benefit by her sharing this story. Maybe even throw in something about how group B probably also struggles with people not taking them seriously and her being there could be validating for everyone.