The second conversation should have been left off, except for saying you won't live in an open M. You were pressing to the point of pleading her to tell you she would work on the M. She was not hearing any of what you were trying to get her to say. And you sure won't get a WW to agree to a transparency plan before she is remorseful and ready to go to work saving her M!
You gave away your source of intell, and she will make sure they are more careful now. Which means, they will carry the A deeper underground. She has no intentions of ending it. She's pi$$ed and more determined to rebel.
As I said earlier, your relief will be temporary b/c other pressures will likely take its place. I hope from this point forward you will not inform her of how much you know. It never accomplishes what the LBS thinks it will.
You need to make yourself unavailable to her. Spend as much time GAL as possible. If you do not detach now, you will see no changes in her or the MR. You have to change the dynamics, and all you have done is show your cards.
Do not discuss these matters with other people, b/c it always gets back around to the W.
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!