[header] How to handle a mean girl [title] Don't react to her meanness. [step] Mean girls feed on reactions. When they say or do something mean and you yell at them, start crying, or run away, they feel successful. 
Even if you feel a little hurt, try to keep yourself composed by reminding yourself that you're strong enough to refuse to respond to and engage in negative behavior. If you're composed, the mean girl won't think she got to you.