All these things you mention as her rationalizations for giving up on your marriage are just that - rationalizations.
Here's a question about 'rationalizations'. If a WAS is 'rationalizing' why they should run away, get a divorce, whatever, are you suggesting that they don't have a 'good reason' so they have to convince themselves it's 'ok'?
Or is it fair to say they are conflicted in their choice, on the one hand they want to stay, on the other hand to stay would mean continuing to deal with thew 'hard issues'. So they rationalize why it's ok to leave?