No. It will do no good. And believe me, if she's moving out, then you are out of the picture and there is a good chance there is some one else. Nobody moves out from a reasonable sense of security without a plan, a very well thought out plan.

SO if you believe that your W did some playing around a while back and grew a conscience now and is moving out now because of the guilt because of something happening eons ago, you are sadly mistaken.

You are of course welcome to try.

IMO she is damaged goods, something happened to her while she was young and stunned her emotional development and she is revisiting it and trying to mend her youth. Did she have a traumatic childhood/adolescence?