I think W is regreting her choices but who knows ?
RD, she probably is regretting her choices, but that doesn't mean she knows how to fix it.
When I was in high school, my bf was in college and he broke up with me to date another girl. (At least he had the decency not to cheat!). A few months later, we got back together. He told me that he realized within a week that he'd made a mistake, that he wanted me back, but he didn't say anything because he knew I wouldn't take him back. He was right. It wasn't until I started dating his best friend that he had the guts to approach me, and at that point I was ready to listen.
I'm pretty sure my MIL deeply regrets leaving her 2nd H, but she won't do anything about it.
Be patient with your W. I know it's hard to hear how unhappy she is, but she has to be the one to do something about it.
How's that for advice when you didn't actually ask for any?