Hi there, I am new to your situation. I agree with Sd above... you stay at and sleep where you feel most comfortable. She is the one making the decision to leave, so she can deal with those consequences that go along with it. Claim your spot and stick to it she will survive. Does she plan on moving out temporarily until the house is sold (if that is the plan). I imagine that you need space away from her to process everything? Perhaps you can put some boundaries into place regarding living arrangements and when you will see her and communicate with her.
I am going through a similar thing right now. My H told me 2 days ago he is done and wants to separate. I have claimed the bedroom and he has moved to his brothers house temporarily until he finds his own place. I told him you are the one who wishes to separate, so you can be the one to leave. I certainly wasnt going to have him break up with me and then him boot ME out....lol.
Sorry for rambling on. Just my 2 cents Take care.
M: 8 yrs T:14 Twins:7 S:5 BD:'NLILWY': Feb/2013 Mar/Apr/May: MC June: "living in limbo" Sept 12: H moves out Oct 20: reconciling Jan-Feb 2014:MC Feb 2014: separating, and H moved out.