Can anyone give some advice please. My DD has been coming home upset a few times as the lunchtime supervisor, who also has a daughter in DD's class, has been telling her off. For instance, yesterday apparently, the daughter told a couple of other girls not to go to afterschool club as my DD was going. My DD said to her "that's mean" and this girl then told her mum who basically accused DD of lying and saying her DD would never be mean! Also last week a similar scenario but again her DD was favoured and my DD told off, even though she wasn't witness to the conversation. To complicate things, she is in my group of mum friends at the school, though I rarely see her but wouldn't want bad feeling between us. But I feel she should be unbiased when working at the school. How should I approach this?