Share your thoughts and opinions, and ask your questions!
I bought the book thinking that it was a biography, and discovered upon reading it that it was written in the first person. It makes no difference. The historical facts are well-researched and footnoted, and the book was very enjoyable.
Obviously it is fictional, the author even says so on the web site. Too bad the publisher didn't call it fiction, but every one knows Diane didn't write a journal.
No, she didn't. That's what most of the emails are asking.