I would just be prepared for whatever answer she gives you. If it more D talk, then just stick with your gameplan: I cannot make you stay, but I do not agree with YOUR decision. It is not what I want. Say it calmly, but firmly.
So, what is the status of any more MC? Is your W still willing to go? If not, then drop it for now.
One thing that caught my eye was your W's statement that she was scared of the way you were acting. How are you acting around her, and has she ever said anything like this before the D talk?
Also, unless she volunteers to talk about your R or her feelings, leave that alone for now.