I like the thought behind what you want to say and you want it to go, but as they say in war - once the fighting starts the battle plan goes out the window.
I will agree with the others, I don't think its wise just yet. Let her hang herself. Others may know more, though.
There are moments in this life when you are so confident in the rightness of your actions, that not even for a second do you consider the option that you might be wrong.