Her book about Katherine Howard is a shocker. I know she was very young when she married Henry, but the way Gregory portrayed her, I kept expecting her to say "OMG he's totes adorbs!!!!!!1!!"
If you ever get bored, the BBC made a version of The Other Boleyn Girl years before the movie. She really doesn't like Anne Boleyn. http://www.youtube.com/watch?v=xftwiCh-xmE
I saw the movie, which was okay (I'm being generous). It did seem to cast Anne Boleyn as a combination of Iago and Lady Macbeth, which seemed...odd.