Another way of looking at this is along the lines of some typical advice here for newcomers; always move at the pace of the slower in the couple. I.e., don't have swinging sex until both are ready for that.
Here, your wife could be thought of as being further along than you, and doesn't see a need to share some details. You're not that far along. You could approach it this way in that you could tell her you're not ready for her not to be 100% disclosing everything.
Honestly though, I'm seeing red flags go up on this. Something isn't right. Get it resolved. Talk with her directly about it.