FIB, I am assuming that your son was not in the C session. I am a little unclear about why you two were together. Did yu tell the C beforehand that this is a very volatile situation and that it would not solve anything for the two of you to be together rehashing it all.
Really, I think she just needs the background in order to help your son. She should be able to speak with you separately to get any answers she needs. And believe me, if she is any good, she will be able to see what is going on with your w.
This going around in circles with your w with this C is not a good thing.
FIB, why are you still so shocked about the things that your w says? She is gone, gaga, crazy, nutso.