Look man you can spin it all you want but I have yet to see a single situation where the WW leaves the house to work on the marriage. Steve has a saying that "WWs don't move out for space they move out to sleep with other people". She will say anything to keep you off her back so she can move out without resistance.
I agree about the entire fantasy life she is trying to live but she is no different then any other WW. She is moving out to pursue her fantasy and whether you want to be or not, you are her Plan B right now.