If you all were seperated at the time, how did she know about your "date?"
I think she just used her women's intuition. D20 grilled me, and all I said was "I'm meeting some friends from work." When both she and wife asked me where I was, I told them honestly, but never said who I was with. I had my ring off (we both did at that time, but mine was only off much more recently. We both wear them again now). I had colored my hair.