"Having just watched and enjoyed "Marie Antoinette", I thought I would read the book on which it's based. "
The book on which the movie is based? Whatever do you mean? Now there is a book called "Queen of Fashion", by Caroline Weber, published at about the same time as the movie came out, but they are not affiliated. It's a wonderful look at MA from the perspective of the way her fashion influenced that period in French history, but it's not by any means a book about the movie.
In addition to Caroline's book, which is really about Marie Antoinette’s fashion and her wardrobe, one of the best biographies of MA is by Antonia Fraser, "Marie Antoinette: The Journey"
Marie Antoinette is a person worth reading about, especially if you read celebrity blogs and tabloids because she was the first true modern celebrity.
Her life reminds me a lot of Diana's and it was tragic for many of the same reasons.