*whew* Thought I was on the Amazon Discussion boards for a minute.
No, she is not a real person, or at least the reviews written under her name and account are not all written by the same person. Smarter people than I have done the math, and it's pretty much not possible for one person to POST at the rate she does, let alone actually READ the books.
It's an interesting conundrum, though, because who IS posting the reviews? They seem to be essentially "back of the book" blurbs except they often get major details wrong. So... basically, they seem to be "back of the book" blurbs.
She is most likely a publishing group, and she is pretty much the major reason why Amazon changed their ranking system drastically about a year ago. It was becoming a minor source of embarrassment for Amazon.