The fondness exercises was my suggestion and day one was okay, day two brought up painful memories and she has now started to pull away again.
I am not familiar with the fondness exercises. But let make something clear. What she may see as "working on you two" may not include a reconciliation of the M at all. You, on the other hand, have that as your goal in every action you take. She may have more in mind of a better friend relationship with you. Saying she doesn't know how to work on the M, sounds more like an answer given when a WAW doesn't want to deal with it (or LBH). Kind of a brush-off answer, so you will leave her alone.
The only thing that will scare her off is for you to push, control, and pressure her. Why did she leave the second time (after piecing)?
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!