My thought is she is seeing how long I might go without emailing something.
You don't get it. She is not waiting on you to do anything. She just wants to be left alone. She is planning her life without you. Will that ever change? Who knows, but it won't change until she's ready for it to change. It's not about you or what you are doing.
You really....REALLY need to move on with your life. Get your eyes off her business and her life. You aren't too old, but you sure aren't getting any younger pinning away for somebody who doesn't want to be with you.
Trust me, if she changes her mind, she'll let you know.
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!