What to do when 'mean girls' grow up to be mean school-run mums: I used to suck up to the head of the group, but was secretly shocked by her cattiness. Then she turned against ME with a WhatsApp that left me shaking. This is exactly how I beat them | Daily Mail Online

As her voice raised ever higher, and everyone turned to stare, I choked back tears. Thankfully, one of the onlookers was the headmistress, who led me away to the safety of her office.