I think it's hard to give advice and make suggestions since we all have differing relationships and circumstances. Some of the suggestions already made would be a complete recipe for disaster for me since I come from a submissive position. Also I realize I am much older then many on here, but I would never attempt to spy on or 'check out' what the wife is doing. That would be VERY bad for my well being. My steps would be:
1. Assure wife of my love and acceptance of whatever she is doing.
2. Then ask her plainly what it was I wanted to know about.
This doesn't mean she would tell me, but it would let her know what I was concerned about and open the door for her to if she wanted to.
3. Then, much as 'Kum Hoar' said, wait for her to reveal what she wishes in her own time.
This may not be helpful at all to you but is what I would do if I was 'wondering' what was going on.
Anyway, Good Luck to you, and I hope you get the answers you are wanting. (needing??)