Her former name was Ardy Bowker. She did some notable respected work on education, studying dropouts. Professor Emeritus is commonly the title given to a retired professor with a long career at one institution.
It's odd that she always says NDN but never which tribe, and even odder that she would make a point of claiming adoption by three different tribes. (For newcomers and outsiders, it's long established that tribes don't adopt, only individuals and families.)
Her UFO book seems to be mostly NDNs today describing UFO encounters, not oral traditions about star people as the book title suggests. And really, should it be a surprise that NDNs are not exempt from the UFO phenomena.
If Clarke really wanted NDN accounts of aliens to gain credibility for the study of UFOs, I can't think of a worser way to go about it. What you'd want to do is bring these accounts to the attention of scholars, historians, physicists, psychoanalysts. The last thing you'd do is go to UFO conferences. That is, unless your aim was to make money as a speaker, or receive the acclaim of UFO devotees.