Choco
This is probably a No but, have you gotten to a point in your conversations with W about what a new M would be like? Or is that just way too soon? Is she not willing to have a heartfelt discussion with you about fixing the M?
My impression is that she is 100% out-the-door (at least in her head) and therefore, any progress between you two will be minimal. Maybe a S would not be such a bad thing. She can gain her "space" and won't feel like you are constantly trying to win her back. Just thinking out loud here.
Until she can gain some of that freedom she wants so desperately, maybe she won't be able to see what she has lost, kwim?
LFL