IDK if I should remind my mom that she needs to respect W's feelings and treat her fairly, or if it is better to just let them handle it themselves. That way their is tension, some chaos. ect...
Only once your wife expressed she is willing to reconcile, and come back and work on the marriage. Then, yeah, you need a "Sister Latifah" moment with your mom.
But NOT NOW. Never shelter a walkaway from the consequences of their walkawayness.