Since this is one particular "psychic" who is telling her this stuff, can you report them to the BBB? If this were a shyster lawyer, doctor, nurse, financial advisor, etc, I would be dragging their name through the mud. I doubt you can do much for sister, other than encourage her to see a therapist, but I would report that so-called psychic. The way you describe your sister makes her seem mentally fragile, and what that psychic is doing is highly unethical. If it were my sis, I'd be using Craigslist, Yelp, BBB, Facebook, whatever platform I could find to drag that shyster's name.