Native American sacred ceremonies are taken very seriously by tribes. A local member of the Hopi tribe was just banished from his tribe's lands because he wrote an essay describing a ceremony for public viewing. This is forbidden. If it is abominable for a member of a tribe to write down sacred ceremonies for an essay, imagine the reaction towards a white woman claiming education, making up ceremonies and calling it all "native american". It's beyond disgusting. It was explained to me that the reason why whites aren't generally allowed to attend more serious ceremonies is because of the tendency to abuse this and warp it into some new age thing. Sounds like Lynn Andrews to me.
I would treat her work as fiction, in all honesty. It is just all very implausible and, if you read the article below, probably unlikely. It probably has some merit in that it is a book that empowers women to believe in themselves but I wouldn't use it as a reference guide about any actual native american belief, ceremony and certainly not as a guide about Native Americans themselves. There are other much better books concerning native americans than Lynn Andrew's mishmash.
Selling Native American Soul