Dianne Arcangel’s schtick is past life regression, and using her skills to make up stuff that people can be convinced has something to do with their “previous lives” and can help them understand their present lives (some cold reading skills come in handy as well). Arcangel calls herself “an expert in the field of facilitated apparitions”. I think one should stress “facilitated”. She has also been associated with, among other pseudoscience groups, The Forever Family Foundation (FFF), which aims to “further the understanding of Afterlife Science through research and education while providing support and healing for people in grief;” that is, delusional crackpottery founded on the exploitation of the grieving. Charming.
Arcangel has presented her stuff internationally, including (of course) on Oprah, and written a pretty execrable book, “Afterlife Encounter”. Her book even contains research: “[…] Arcangel’s groundbreaking five-year international survey, the first of its kind, revealed the positive effects afterlife encounters have on witnesses.” Sounds rigorous. And it is endorsed by Larry Dossey.
Diagnosis: I don’t think she’s a fraud. She seems to genuinely believe that she is researching the afterlife and actually helping people. She isn’t, of course. Completely lost.