Her "final page" comment means the final page of the beta document, where I asked people to give their overall thoughts on the book. She doesn't mean the final page of the book itself is brilliant. (Though I'm not saying it's not; RAFO.)
I think it's best for beta readers not to say anything, for now. Or if you do want to say something, clear it with me first. It's not going to be like the Wheel of Time where there are draconian restrictions, but we should be careful to consider the amount of time left before the release and how jealous people will get.