Did one of the scoobies betray Juliette to the Wall? I've been thinking about this and it's very possible. They knew everything there was to know about her. They knew she'd turned into a hexenbiest with no possibility of a cure. They knew she had no family that would come snooping about. Could one of them have betrayed her and if so, which one? If that happened, I'm thinking Rosalee as a possibility.
The best way to frustrate a cyberbully is to ignore him.