Punchy, from my most recent experience, do NOT let her know you know. As a matter of fact try not to know. Don't check up on her. It will backfire, I promise.
I can speak from experience since it just happened to me today. I wish I could start this day completely over and now I have to refix things I thought I fixed.
Also, chances are you are making a ton more out of it than you think. Paranoia is hideous to us right now.
m 40 w 38 married 15 together 18 d11, d8 bomb 12/19/10 2nd bomb 3/30/11 COMPLETELY DONE