Well, if your way of detaching is getting upset and saying "whatever" then you are not detaching in a healthy or proper way.
I don't understand why you wonder why your W is acting like this. I think we all know why. She wants OM and can't have him. Her fantasy has been busted by her job and you. She views you as the obstacle to her happiness. She also sounds highly depressed and in need of some sort of medical assistance for her mental health.
It is not normal for a grown woman to sleep and watch as much tv as your W does. It certainly is not normal for a grown woman to mumble as a form of communication as your W does. It is not normal for a grown woman to need somebody to make her something to eat as much as your W requests. It is not normal for a grown woman to communicate to her H through a dog. It's all beyond bizarre and I type this as a person who (A) does have a chronic and incurable disease but I can get it together better than your W (B) who lived in such a highly depressive state for over a year I thought I would die and (C) who eventually developed a situational clinic panic disorder.
I know you treated your W very bad in the past and that is a shame. But now she is treating you very, very bad and not only is it a shame it is all very premeditated IMO. And that doesn't make her somebody that is confused or lost, no, quite frankly it makes her a very undesirable human being to even read about let alone have to be around in person.
I don't believe in the "fog" and all that BS. Your W knows exactly what she is doing OR she is deeply mentally disturbed (I don't think she is).
Personally, until she decides to communicate with you in ways that don't emulate a deaf mute then I would just leave her be and get on with your life. The more I read about her the more ridiculous and cruel she seems.