Thumpered, you situation seems similiar to mine. I can say that Dbing has helped improve my sitch with respect to my MLC wife. Giving her space, validating her, and doing 180's has relieved the pressure and she is no longer thinking of ending the marriage. With that said, she is not quite fully committed either -- but this situation is much more workable.
I think women in MLC do feel guilt, and I find that when my W is feeling guilty about her behavior, she becomes more 'loving' toward me. For example, my MLC W also texted me that "she missed me" yet only 2 weeks earlier than that she mentioned leaving. It doesn't make sense. So it is a good sign, but don't read to much into it.
I think, if you want to keep your marriage, then 180's, detaching, and GAL wiand simply wait out your wife as she goes through her MLC.