Tim,
Yes the counseling is for her but I don't think that you pointing that out, or having a 'tude about it is going to really make her take ownership of it. I would suggest a more devious approach. After all, I am a woman and I know how to scheme. (btw, your wife is scheming her ass off in regards to that seemingly innocent question, imo)

I would say "you know, I've been thinking about your question re: the C. But first let me ask you this--what do YOU want to talk to her about?"
And encourage her to talk. Her issues might not be the ones that you want addressed but if this is truly to be her counselor, then she needs to do whatever feels natural. If, however, you want this to be marriage counseling then you need to attend with her and you will have the opportunity to air your thoughts.

I think she is taking your temperature. Trying to figure out if your happy mood (because of the nookie) has eliminated any need for her to address this with the counselor. She might feel like you guys are on the right track (when you feel that you aren't even ON the track yet) and that she doesn't need to bring this up in C. But before she does this, she is trying to see if you still think there is a problem and if you will be disappointed in her if she doesn't make this a hot topic for discussion.

Ok, that is my little bit of ASSuming and mind-reading on Mrs. Tim!