If she thinks continuing to discuss this is important for your health, then she's within good practice. If she's doing it from her private sense of justice, she's way out of line. It would be considered "exerting undue influence" and an ethical violation.
In the greater karmic universe, a non-action is an action. But that is a matter of personal philosophy regarding responsibility, and her view is her view--she has no right to impose it upon you.
Did he abuse your friend, too? Why is ignoring the potential impact on your friend less important than the impact on other potential victims? Her reasoning seems very simplistic to me.