I'm not sure you can rely on her word. Are you sure she's absolutely honest or could it be she's enjoying jerking your chain?
Because of my reluctance to believe she's snow white and her word is gospel, if it were me, I'd be quiet. I'd also get rid of that email forever and ever and try to focus on my own healing and vow to walk on the side of honesty and aboveboardness...that may not be a real word but I think you get the idea.
No scoldings here. Quite often I find myself being both Laurel and Hardy..."another fine mess you've gotten us in!"
There are many people here with much more wisdom than I...I just know that is how I would react.
I wish you the best regardless what you decide is best for you.