Your W sounds like she is daring you to do anything. She is so bold with her rebellion she sounds as if she is wanting to see if you have the b@lls to kick her out.
I did not mean that you were never to have contact with her, but I meant that you were not to be trying to sweet talk her into reconciling once she leaves. If she cannot reconcile for the right reasons, then it would all be for nothing.
I really think that she and OM will end their A once she is depending fully on him and he has to deal with her and his W, but you have to make this decision on what you think you can or can't do.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!