Your W is gone for now, you just have to let her go. The "civil" chapter of your lives will take a while to happen (as it did in my sitch), but it will happen. U will reach a point in your sitch that your W will be more pleasant, and will want to interact with you more frequently. Your W is acting the exact same way mine did (when I was still not detached completely).
At the moment, every time your W sees or hears your voice, it upsets her. It is making OM so much more appealing to be with and around. I had the same thing happen to me. I changed all of that. Now, I am more reclusive around W, and find that she is trying to contact me more and more (mind u, she is still on her path for D and selling up etc, as I have not baulked or tried to stop the process).
She rings me almost every day (I have not instigated a call to her in over 6 months, even in regards to DD, as W has been in such constant contact I have not had to do a thing).
She is not spending anywhere near as many late nights out with OM, and more time with DD. I have not tried to force anything on to her, she has realised this herself (in regards to what she was doing to DD). I think this is what has helped, letting W come to the realisation herself, and not me "telling" her.
Long winded post, I know. But if u can just let W go for now (as hard as it may be), I reckon it won't be long until she starts to warm to you again. There is too much history between the two of you for it not to happen (as in my sitch).