I do find the timing of this email strange, something just isn't sitting right especially given the questions I was getting from my son also this week..
I would not give it the attention she intended by sending you that email. To me, she is wanting some type of pleased reaction from you.........as though you are really impressed with her.
It appears she is using her little boy as her source of information about daddy's interactions with any females. That seemed evident in him feeling that he needed to tell his mom about daddy talking to another woman. I mean, he's only seven yrs old! He may be a very sensitive and smart child, but I can't help but believe he has been instructed to keep his eyes and ears open and tell her everything.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!