Edited to add the comment I was responding to:

Every single adult who knows this is happening to a child and doesn't report it shares the guilt for what is happening to her from that day forward.

http://www.child-abuse-effects.com/duty-to-report.html

In Canada, if someone knows of or suspects that a child is being abused, that person has a legal obligation to report the known or suspected abuse. Failure to report can result in charges being laid, as well as a fine of up to $10,000....

All of us must take responsibility when we suspect abuse is taking place, not only from a legal standpoint, but from moral and ethical obligations as well.