When I brought up "for the sake of the boys", she stopped me and talked about sensitive she is on that. She's feeling a lot of guilt.
Bill, you are right, she IS feeling a lot of guilt. And that's ok. You don't want to save her from this, but you also don't want to make it worse - then YOU become the problem in her mind.
Also, if she decides to come back, you want it to be for the right reasons. Guilt is NOT one of those right reasons. Love for you and the family IS a right reason.