Hey there. It sounds like you are handling it really well and were able to express yourself (which is so liberating)...
It does seem that her need to separate is so much more about her than about you.
I guess I just really relate. It is hard to have one's partner check out of the M for to fulfill their own needs, but here we are.
What struck me most about your post is that it sounds like you have managed to turn it around and really look at her and try to determine if she can meet your needs. I think us LBS end up feeling so sized up and tested, I feel like I'm under a frickin' microscope. But that is an illusion, right?
I'm very impressed and I hope you are doing as well as your post reflects.