My Youngest has got in with a bad yin, shes only 11, but this girl would cause trouble in an empty house, shes been expelled from school, had several warnings also from school, and still the havoc continues. Now we have stopped for summer holidays and they are both starting high school in August, this girl continues to upset my daughter on a daily basis, and i really dont want my daughter playing with her any more, how can i politely tell this girl to leave my daughter alone without making the situation worse for my daughter......Can anyone advise please...... 
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