Your W sounds like me a year ago. I know that 'dead inside' feeling. I felt as if some emotional breaker had been blown inside me. I didn't 'feel' anything. I thought I wanted a divorce too... I thought I'd be so much better off on my own... soooo laughable!
It was when my H went into his own crisis that reality hit me... I was going to LOSE my H!! That reality hit me like a big fat brick from about 20,000 feet!
You're wife doesn't want to lose you. And that is why she hasn't filed for D. It's an idea... a fantasy. I wish I knew what to tell you to do to snap her out of it... I know it was when my H withdrew from me that did it for me.
I can tell you that pressure will keep her there... work, home/kids, you...