Whenever a woman can't give a more extended excuse for wanting a D except saying she wasn't happy.....causes me to think she was looking for something or someone that would make her happy. And in most cases, women have their heads in a fantasy cloud, thinking life will be grand and they will continue to have everything they have now, plus freedom.
If she appears to just want the advantages of M without the disadvantages......I would still stand on what I said about the friendship thing. If she's lost her attraction for you, I still stand on it.
You want her to feel differently about you, right? You want her to see you more than a friend, right? Then detach and stop being available to her. Stop filling the H role. GAL without her. Stop making it so easy for her to use you as a friend.
She needs to think she has lost you, and you have moved on. How much do you think she worries about it?
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!