I recall thinking about the mountain my wife would have to climb to help rebuild the marriage after her betrayal. There was not just me to regain trust with, but others in my family that knew what she had done. I felt they could forgive her, but would she ever really feel that they did not still hold some contempt for her?
Reading what your brother wrote in the book just reopened a wound from the past. She has feelings that she is percieved as untrustworthy by your brother and others. I can understand her wishing that was not mentioned in the book.
I think it is a tough road back up that mountain and there are many valleys along the way. I believe you are willing to stick with it for now and I applaud and respect you highly because of it.
You have a gift of knowing what love is and you express it well in your songs. Have you ever sung or shown your W these songs?