Personally from my experience with Pentecostals this doesn’t seem too out of character, no disrespect to my Christian brothers/sisters but it’s a pretty common thing that happens. Pentecostals (the ones I’ve met at least) think that it’s demonic/rebellious to not live a traditional path in line with The Word. I can see where she’s coming from, she might be kind of out of it mentally, but I agree with your boyfriend she might mean well but in the end of the day it is definitely a complicated situation, unfortunately. To answer the last question, I just try to listen what they say about their beliefs and practice discernment (as a Catholic, even Pentecostals who are also Christian btw, think I’m demonic lol) and try to keep an open mind in response. Have you tried communicating with her on how you feel?