Now that you have taken back the MB try to go dark, detach/NC. If she is already asking for a D and you want to stop it the best course of action is NC. She can't fight with you if you don't take her bait. Don't discuss the D and don't help her. She might not be able to get it together enough to push for the D. Do not feed into her, the fighting gives her power. You want to take her power away. Don't rush into anything, if you are not sure post here and get some opinions. If she wants a D she will have to Sep. Make her move out. Do not be afraid of a D it will only give her more power and it is only a piece of paper. You are a long way off from it.