Have you tried deep-cleaning her (aura, chakras)? It might have been a thoughtform launched on her as she was considering dedicating to Satan. You might want to try doing some cleaning for her, you don't need to be near her, best done while she is sleeping fyi. I think it's worth a shot if you've been close for so long.
Maybe also a working with Ansuz to remove any enemy influences from her. Today and tomorrow are good days to do this, waning Moon in Aquarius.