In our house if someone can't speak nicely to the people around them, they need to go be alone until they are able to be civil. However, since you mentioned that your older dd has been bullied, I wonder if she's still processing that (or still being bullied?) and so she's trying to build herself up by knocking her sister down? So, I would try to both address the issue of being mean, and make sure she feels okay about herself.
9/7/10 at 1:13am