Seeing people who aren't there sounds like schizophrenia. It's possible a traumatic childhood experience still has a great effect on her psyche even to this day, but unlikely. The desire to study new age research or alternative therapy methods isn't necessarily irrational. It simply requires much greater care, and is much, much more likely to lead to errors than traditional science. Even if some therapy she really likes is completely useless, if she believes it works, the placebo effect can still be quite powerful. Whether or not she is schizophrenic would require an independent evaluation. If she's not prepared to accept this possibility, broaching the subject is going to be very difficult.