Interesting how everyone knows that verse, but no one bothers to find out what it means.
Christians are fully capable of judging deeds. What we are not to do is judge the status of someone's soul, nor assume that we are greater than another because of our ability to see their faults. This woman is certainly no better than I am (and, in all likelihood, is frankly much better of a person, if we are equal in our status as sinners).
Jesus was also clear about how to organize around public refusals to acknowledge ones' problems:
Its worth noting that the next verse (“Truly I tell you, whatever you bind on earth will be[e] bound in heaven, and whatever you loose on earth will be[f] loosed in heaven.) forms (as I understand it) the basis for Catholic Excommunication.
All of which remains immaterial. Forgiveness is not the same thing as continuing to allow someone to be in a position of influence over children.