You can't make someone stay that doesn't want to. Leaving doesn't mean she won't be back. One characteristic of a WAS is that they need time and space for things to be put in perspective. It is hard as heck to let them go, I won't lie to you.
You might get more response if you post your situation on the newcomer's forum.
Me:53 W:50 M:29 years T: 30 years Children: S21, D12