My DD started year 3 this September. There is a girl in her year group who always picks on my DD. Basically she doesn't let my DD play with anyone else, she comes and disrupts and takes her friends away , most of the time she succeeds but few occasions friends refuse to go with her. This has happened on and off throughout year 2 now it has started again in year 3. She doesn't let my DD join in with their playing basically isolates her. I have spoken to the teachers but it hasn't stopped, is it just normal behaviour of 7,8 year olds? My DD comes home in tears at least 2,3 times a week. Thank you for your consideration