about how wonderful we once were, and how we can be again AFTER the big D. She is in a fantasy world.

There's something to be said about the psychological implications of clearing out the old relationship via the proxy effect of a divorce. Maybe that's how she's feeling about it, because it sounds like she's favorable to a fresh new start wherein the relationship becomes "wonderful". If that's a fantasy, it's a good one for you. Turn it into reality for her.