Dealing with a mean girl is never fun. That being said, there are a ton of ways to tell if she is a mean girl. If she is constantly cruel, rude, mean or harsh to others, chances are shes a classic mean girl. They will often put everyone down and use mind games to get her way. Stay neutral against them, give her a taste of her own medicine, or even put her with someone who will deal with the crazy that she causes. Be true to yourself and never give into them.