JRuss, it seems to me you're practicing a bit of mind reading, trying to imagine what effect your W's echo chamber friends and IC have on your W.
Why not just confront her? Tell her, "Hey, come on, let's be real. You're being selfish. Let's make sure we've done all we can to save this marriage before we give up. Let's talk about what we can try."
Come on over to my thread and see how well that approach goes...
Me: 50, MLC/WW 45 Young kids Nov 2015: BD1 Apr 2016: BD2 Jan 2017: W filed Feb 2017: D final