A year ago, I don't think this kind of an exchange would have been possible in your marriage. Look at what you've accomplished! Dude, I'm proud to be your friend. I know that confronting her is not high on your list of fave things to do, but you've set your mind towards a course of action and you are seeing it through to the end. It is admirable and attractive.
I think your wife has sensed a change in you--she knows that she no longer has your balls in a vise and she is acting accordingly. Congrats on your progress and don't stop now. Insist on the MC session next week.