So I have reason to believe my W's IC is helping her to move on from the M... anyone else dealt with this?
Absolutely. My W's IC was the strength behind her hammer to find encouragement to file the D. I know this because her first few sessions she talked about how much she loved the IC, how helpful she's being, and how she's helping her deal with things she's been keeping bottled up in a compassionate way...
Fast forward 5 weeks. My wife hates her IC, wants to find a new one, asked me if she could start seeing my IC as I love her so much, and started telling me things about how her IC and her don't really see eye-to-eye anymore, and that their sessions have turned more into a "picking a brain session" as opposed to a nice, calm, compassionate 'do what's right for you' sessions.
It all depends on the person in IC, but my W used the IC for what she needed, and is now bailing out because the IC is making her look into her own self, and helping her find "root cause" of where all these problems are stemming from... and surprise surprise, (<whispers>: it's not all me...)
I've said this in other posts, and my view on IC is that the patient/client/whatever, will only get out of it what the want. especially in the case of someone like my W, or maybe all WW's, in that they run for the fastest and easiest form of medication they can find, to fix what they feel is most important now, in place of what is most important in life.
I'm sorry it's happening like this, but there's nothing you can do to "get" (see that word?) your W to disbelieve in her IC that won't make matters worse for your cause. It's gonna run it's course, and I hope your W's course is better than the one mine took. Good luck, friend.