I also have concerns about us being alone together for 4 days. You haven't spoken to me since Thursday. I understand. I haven't done what you asked of me. I've done a lot of asking myself why. And why I got so angry with you when you pushed..not sure.not sure I am able to give up control of my life that I have built over the past year.'....
My response would be "Then I guess I have my answer. Because at this late date, no decision IS a decision as far as I'm concerned."
And then I would show up for the MC session, ask her in front of the MC if she is willing to send the no-contact letter and be fully transparent with you and come back and work -- REALLY work -- on the marriage . . . and if she wasn't . . . I'd be polite, thank the MC for their time, and I'd say "Then I guess I have my answer. Thanks -- I'll leave the rest of our time for you two." And I'd leave.