I will spare you the 2x4's for the moment ... or not.
Its good you have intel, and let me tell you from experience ... use my 2 years of this in some way. IF ... and thats a HUGE IF the W ended it with OM, there are strong relapse chance, she just pulled the drug needle out of her veins and very well will want that back .. I lost count with my WW she had over 6 break ups .. sometimes I think they do that to have that rush of 'fixing' it and all that comes with it.
Lets say for the sake of argument she did end it .... get ready for her withdrawls ... depression... sadness as she mourns the end of her AFFAIR.
I have mentioned I would not go to MC till I knew ... I feel that you are all to ready to let her off the hook and allow her back into the M to easily ... what will she learn here? Oh I had the A, but t33 really did not seem to mind so a OM2 could VERY well be an option .. you need to DB my frend .. if you have problems, questions, concerns ... I have not seen a presented issue posted here that one of the wise vets did not have a solution nor approach to .... its up to you to use these resources ... I can tell you I would have NO SHOT at repairing my marriage (Which I am currently doing) without several people here .. I honestly can tell you that.
Do not think you have it figured out and your W is different ... do not make that mistake. She is wayward and has not shown remorse .. you have allowed a cake eat fest ... I have yet to see a WW niced back into the marriage.
Does she respect you? Is she afraid of losing you? What has changed to make her stop her A .... other than OM not wanting a R ... she is still wayward.