WAW having an A but she denies it

[shodan]

so i just learned that my wife lied to me about a girl's weekend a while back. May 31-June 1. She told me that she had a girl's weekend with some friends, last minute thing. Her dad had died a few weeks before, so I just figure she needed to blow off some steam. After learning of the A a few days ago, I emailed the person whom she said she went with and asked for some recommendations on the location. I told her that my W had a few friends with her name, so perhaps she was not the right person to ask. Her friend just wrote back and said that she did not do a girl's weekend with my W. I wonder if this is when she first got together with the OM because a week later she asked for the D? I want to forward that email thread to my W, but I am sure that is not the right approach.