Until she is ready to have transparency, she's not ready to work on the M. It's as simple as that. M should have no secrets. Privacy is when you go to the bathroom.....secrets is when you let third party into a M.
Some women break off EA with one man but get into another EA with someone else. They do this b/c of their fantasy addiction. I think that is why she's not ready to commit.
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!