No way to tell if she's being honest about the abnormal test. I'd assume she is but with a touch of detachment on hand, maybe?
The letter should make for some interesting and (likely) troubling reading. Stay detached (easy for me to say!).
She really seems all over the place; rubbing the PA in your face and unapologetic, but wearing revealing or very little clothing, wanting to talk over drinks, writing you a long letter, staying up really late . . . just really all over the place. It has to be hard holding it together for your D's sake. I'd want to run screaming and shirk all responsibilities for a month or two.
Me: 46 W: 44 Married: 17 Together 21 D13; S10 BD: 03.03.15 (Not attracted to you) Almost 2 years trying, alone, to save marriage Status now: Divorced (effective 06.13.17)