Here is her California physician's license:
[link to www2.dca.ca.gov]

Here is her medical profile:
[link to www.healthgrades.com]


Here is a scientific paper written by her sister Jean Maria Arrigo, Ph.D, who describes herself as "a social psychologist studying intelligence ethics and as daughter of an undercover intelligence officer":

"Military and Civilian Perspectives on the Ethics of Intelligence—

Report on a Workshop at the Department of Philosophy
Claremont Graduate University, September 29, 2000"
[link to www.usafa.af.mil]

She states in the paper:" A physician at the workshop, Sue Arrigo (my sister), discussed medical intelligence operations in hospital intensive care units (ICUs)

Sue Arrigo's sister has done work on multiple personality
[link to www.caseassist.com]

Here are the details:
TITLE: Textbook Models of Multiple Personality: Source, Bias, and Social Consequences.
AUTHOR: Arrigo, J. M.; Pezdek, K.
PUBLICATION YEAR: 1998
AUTHOR AFFILIATION: Claremont Graduate Univ., CA. School of Behavioral and Organizational Science.
SOURCE: In: Lynn, S. J. and McConkey, K. M. (Editors). Truth in Memory. New York, NY, Guilford Publications, Inc., 1998; pp. 372-393
ABSTRACT: Textbook descriptions of multiple personality disorder (MPD) were reviewed for consistency with cited sources and available scientific literature. Content and citation analyses were also performed to examine the selection of sources used to support common models of MPD and qualitative analyses compared the treatment of three major MPD cases. A review of PsycLIT abstracts published during the same period as the textbooks revealed strong support for the trauma model of MPD, which explains that MPD is caused by external, severe abusive stressors. However, the textbooks also described other models of MPD, including trait MPD, caused by an internal defect; fake MPD, or deception; and measurable MPD, which identifies the characteristics of people with MPD. Further analysis revealed that the textbooks were not consistent or complete in summarizing the cited research, especially information about trauma MPD. Likewise, the textbooks were inconsistent in fidelity to sources that reported popular MPD cases, including Bianchi, Eve, and Sybil. The social consequences of inaccuracies in textbooks are discussed. 49 references, 1 figure, and 4 tables.
KEY TERMS: multiple personality disorder; memory; repression; dissociation; social policies; professional training; literature reviews
PUBLICATION TYPE: Chapter in Book
INTERNET URL: [link to www.guilford.com]

In view of her (and her sister's) medical background and the statement by her sister that her father was an "undercover intelligence officer", I think you will admit that she is a credible person.