1. Do not pay attention
The first thing that comes to my mind when I think of the best way to cope with a mean girl is ignoring her. A mean girl needs your fear and she will do everything to make you feel insecure. So if you don’t pay attention to her, she will probably cool off. You may find it difficult not to hear all the rumors she is inventing, and it may take some time for all the made up lies to extinct, but it will be much easier eventually. You will understand that it all was worth it when your life returns to normal. Ignoring is the first thing to try in such situation.