I would say that Veronica is spot on...especially with what she said about the OK days...sometimes what we're learning through this process is how to have the energy to get through those days - and back to the great ones...since they will always come...even in the darkest of moments...the great days await.
As for your W's idea of going back to school - I imagine supporting her decision - letting her know that you support her decision - would be a good thing.
And I know that living in a state of limbo can be brutal...I lived in limbo for many months before I just came to accept the truths of my situation...(which is very different from yours, btw...my W was abusive and, well, threatening...so I had to get out in the end...to protect myself). Still, despite how different our states of limbo are - I think what we do with that time isn't all that different - in that it involves finding ourselves, focusing on ourselves in the healthiest of ways - and continuing to feel - not just analyze - but really feel the emotions and fears that have gotten in our way over the years.
Stay strong...and by strength I never mean holding back your tears...sometimes, when the pain and sadness and the confusion piles up enough...the best thing to do is find a safe place, sit down, and feel it...Doing so tends to bring a lot of clarity.