You're correct that she's published four books.
But I wish I shared your confidence that any of them are personal experiences. I loved seeing the description of the original book: "However, the most unbelievable story is Autumn's personal experience as she explores erotic tickling for the first time in her life, through her reflections on an evening that took place during her last year as a Cheerleader in College."
In fact, I almost bought the book just for that chapter, as I have no interest in reading someone's made up stories about voodoo tickling by ancient tribes, or anything else fictional in this space.
But thinking about it more, it doesn't make sense to me that an author would fill a book with fictional tales in a bunch of other chapters, and then pivot to limiting herself to an honest, true story in exactly one of the chapters. Same logic applies to additional books marketed as a series. Seems to me, once you decide to embellish, you're unlikely to stop and stick to facts in one section of a larger series. It's fine if others disagree, but I just found myself wishing someone would write an honest, non-fiction book of these kinds of stories. The real stories are clearly out there. Most of us on this website could probably tell a few ourselves. I certainly can. And the quality of her writing seems solid -- which is an important factor too -- and makes it different from most amateur writing on web forums.