If she wants out REALLY bad (and I'm not convinced of this yet) and is consumed with guilt, she may be willing to negotiate on the house. However, you're right that new digs might be better for your mental health.
I agree with the others who are saying back off for a bit. Focus on yourself for yourself not for her.
Even though my husband's death was absolutely the worst thing I've ever been through in my life, knowing that he was gone and I would never see him or talk to him again, at the time I remember saying to someone that it might be even worse if he were alive somewhere and no longer loved me... but I survived and, whatever happens, you will, too...
