Why? You ask why my featherd friend? The answer is dead simple... It is to minimize her guilt.
What can you do you ask? Not a damn thing. So the sooner you stop looking for the silver bullet, the better it will be for you. Now is the time to focus on you and the kids and you let her be, where ever she might be... The less you give a fcuck about her, the better you will feel. I know it sounds backwards, but trust me on this one...