The best thing to do is to treat this as real. Sometimes schizophrenia can be handled with proper thinking. Sometimes there is actually a demon. So have her ask herself...What profit is being made by attacking her? How is this helping the demons? If there is a way they can affect you and win more souls they will do it. Otherwise they dont bother people. Especially JW's because they dont believe in ghosts. If there is no reason for this then it is probably just in her head. Even through halucinations she can rest easy because she has ruled out demons. Then its just a dream.