IMO, your best bet is to ask the questions you want to ask when you want to ask them, and if your WP (partner?) wants to R, she needs to answer them. Answering Qs in a CC session makes sense, if the CC is half-way decent, because that way both parters have support. (Wouldn't have worked for me, though, because our C wouldn't have been willing to move in with us, even if we could have afforded it....)
There's actually some published support for my opinion - http://www.dearpeggy.com/free-pdfs/help-for-therapists.pdf is a free version of a book you can also buy from Amazon.
The book is a report on a survey of BSes. Slightly over half the respondents R'ed, but the BSes who said their WSes answered all their Qs R'ed at a much higher rate than those who said the WSes didn't answer Qs or answered only limited questions.
Your WP may think you know everything of importance, and she's probably right. My W said the same thing, and she was right - but I couldn't know that unless and until she answered all my Qs.