Would I be better off suggesting to her that she should start looking for a place to move to?

Tell her “this isn’t going to work out due to contact still with OM so I’m asking that you start looking for a new place to live.”

M: 34 W:34
D:7 D:6 S:3

M: 9.5 years T: 12

OM found & BD (by me): 9/19/18
IHS begins
W informs me she's moving out: 11/28/18
W files: 12/21/18
D Final: 2/25/19