1 new of 424 responses total.
I think users should only be allowed to scribble new posts. If they posted something a year ago, its part of grex's history, and there is no guarantee that the other users in that item are still around. In which case, you could have old users whose own comments could well be taken out of context by the scribbling and they might not be around to better explain what they were responding to. It is not fair. Everything, every response and every item Valerie deleted should be restored via backups and then she should only be allowed to scribble stuff that was posted a reasonable amount of time (six months? a year?) ago.
You have several choices: