I think she will call it in-house separation, which means she has all the advantages of M without the responsibilities. In other words, she continues being wayward. If you balk about something, she will scream "we are separated and I can do whatever I want". However, she will expect the same privileges she's always had as your W. In-house S is not pleasant b/c it's not really a S. You are still thrown together with all the problems, and your stress level can go through the roof as she goes on her merry way and leaves you to take care of house, kids, bills, etc.
This is so TRUE!! Even though I wanted to work on our marriage, when my WW moved out, my stress level dropped like crazy!! I was very detached by the time she left also. By being detached and my stress level dropping, I was better able to be there for my kids and work on myself.
Me:44 EXW 44 Wonderful Children M11, T14 BD 6/14 OM Confirmed Divorce Final 2/25/16 "It works if you work it!"