Although I'm familiar with your sitch, I didn't read the last few pages of your previous thread. If what Rose said is accurate, that WW went NC and quite job to get away from OM, then I agree with her wholeheartedly.
Let me ask you this, has your W done what you would need to let her back into the M?
If she recently went NC with OM, then she is processing a lot of emotions, and she is not always going to be happy, and she will make decision / say things based on emotions. Ignore those, if she wants to move out she will, if she wants a D she will file, barring those actions, what she says doesn't matter because just like you, her feelings change.
If she hasn't done what you would need to let her back in the M, (I'm not talking about showing remorse, apologizing, anything like that. I'm talking about stopped having A, seeing OM, etc), find a way to let her know what she would need to do in order to get back into your M, then be a lighthouse. if she wants safe port with you, she will know how to get there.
If she has done what you would need to let her back in the M, then this is where you need to be the biggest brightest light house ever. You need to be stable, safe, a place that she knows she can find because you are shining your light. Now would not be the time to have R talks, tell her how much your hurt, etc. Now is ONLY the time to validate, and be cool calm and collective.
Like Rose said, lose the mysterious, be open about what you are doing, tell her she's welcome to come, don't be afraid to be home with her, don't be afraid to talk about superficial things, spend time with son as a family. If her A has ended, now is the time that doing these things may make her realize it's with you that she wants to be.
you may want to give my thread a quick glance from this point going forward, lots of advise on what to do once the A has ended.