I am actually willing to buy this, only because death is different than those other things - a sudden death like Will's comes with so much regret, which is different than the anger at a cheating spouse. I think the stay-at-home life wasn't actually her dream life at all, either. She strikes me as someone who can cope if there is Action to Take - so in the case of Peter cheating she had Stuff to Do - get a job, etc. With the death of Will, she has no tasks to focus on.