True MLC's are scary things. They can make sane people do things you never would have expected and rewrite all of your history.
Truly, truly, do not move out. It is your home. While she may have decided how she thinks this will go, you are under no obligation to make this easy, simple, or for that matter, inexpensive for her.
Stay calm and resolute, focus on you, but set an anchor and hold on. Once she realizes things won't go as smoothly as she thinks, the storms will kick up.
Me 45, H 46, S 23, M 26, Together 30, Bomb 6-2-08, S 6-19-08; H left 12-29-08. H home 12-09, Still MLC in 2012! Me- I have my big girl panties on. Bring it.