Is she ready to send OM a no-contact letter and be fully transparent with you? Have you done any studying about those key things?
Yes, now is the time to identify -- and then communicate to her -- what your three or four or five key deal breakers are (ex: 100% NC/transparency, MCing with a MC specifically trained in dealing with infidelity, full-panel STD test (show results to you) if affair was physical, etc.
Sorry, don't have time to re-read your sitch at the moment. At the hospital with my wife for her hand surgery. I'll try to check in later.