Wow, Tal. That's a toughie. Maybe you could tell her that you will not judge her and that you always will love her. Let her know that you realize that there are always two sides to the story. Maybe tell her speaking from experience you know how painful it is to be on the other side and to think of her children.
I would give her H the book and tell that she should not know about the book in order for it to be effective. Which we all know is true. If our spouses knew about the book they would think it was manipulation.
Life's challenges are not supposed to paralyze you, they're supposed to help you discover who you are. -- Bernice Johnson Reagon