I didn't have an EA or PA, though my XH did, and he was a WAS. When I ignored his single hint about MC about seven years into the M, I was simply unhappy in my life and had unresolved issues from earlier in my life from my childhood and teen years that were part of that unhappiness that I didn't want to grapple with.
So, I don't really know what to say about your W. My guess would be that C will help her deal with her unresolved issues (her conflicted feelings about M because of her mother, for instance, probably leave her with a distorted view of what love and loyalty in an M require that leaves her unenthusiastic about M) and bring her closer to a place where she might be able to work on her current issues in your M. But I really dunno.
I can tell you when XH dropped the bomb I had seen a C for a few years and was growing *past* XH. At some point, I insisted on MC and he went, but he would not confront me on anything he was unhappy about so it was unproductive. At bomb time, I was ready for MC again, but, although he went, XH wasn't ready to do the real work because by that time he was avoiding confronting himself AND avoiding confronting me. I think he tolerated it mostly because it was focused on my own confessed failings in the M and his extreme blame-me-for-everything-wron-in-his-life accusations that miss real confrontation because they don't get real about the problems in the M, but when things would shift to really look at him, he shut down in it.
So, anyway, I think MC can very often be pointless, or worse, do more harm than good, when one or both partners aren't ready to confront both themselves AND each other in it. BOTH are essential to it being a productive enterprise. And both require pretty strong people who have themselves together enough to know what they want, to be able to break ties of sick enmeshment, and to be able to set and enforce boundaries.
