What you are really wanting to do is shove the hard evidence in her face to show her you have the proof in hand, and you aren't crazy. You want to make her own it. But for whatever reason she has to continue denying the A, I doubt she would admit it if you showed pictures.

So, other than whatever temporary gratification or justification you might experience right then......I honestly can't think of what it would accomplish. If it makes no difference in the D settlement or child custody, I see no reason to go that route. But then I see no reason for her to lie, either. Why does she care?

Is she protecting the OM from something? Is he M, have kids, job position? I don't get it.

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!