Ok, I have signed out on leave. And am finishing up my last minute stuff. Question: What if, my W tells her L about the A? Do I still have leverage? I mean, what if my W just tells her L, and the L tells her to stop seeing OM? Am I still in good shape? I am certain my W is going to go through with D. I am CERTAIN. I have GOT to let go of what she is doing/thinking.
All things that are out of your control. If her L knows, then, if he's a decent L, he will be frank and honest with her about the implications and consequences she has brought upon herself. It's leverage you will never know you have - but which will reveal itself in the end. And, what is done is done - she can't unring the bell at this point.
And, yes, you have to let go of what she is doing/thinking, but that is part of the process. It doesn't happen overnight. But you have to keep walking along that path.