I agree that some of those comments were very nasty (I hope mine came across more measured than hurtful), unnecessarily so, even considering the nature of her transgression and the fact that there's really only peer disapproval as punishment. Your reply was very gracious and respectful. Forgiveness is a good thing, but people need to learn that there are better ways to deal with loneliness etc. than taking someone else's work and pretending it's their own.