Hi, looking for some advice.
DD is 7 and has this friend who lives in the next street. They've been friends since nursery - not best friends but have always got on fairly well.
DD's friend lives next door to a girl who is a couple of years older and when DD and friend are playing and this girl turns up, DD's friend starts being mean to DD. I think she is influenced by older girl. (But not entirely because she has been a bit like this in school too).
Once DD came home upset because older girl said she looked like a baby with her pigtails in and that 'friend' was laughing along with older girl. Yesterday DD was playing with a different girl in our street, 'friend' came down and played with them too. Last night when tucking DD into bed, she told DH and I that this 'friend' had said that the other girls' holiday braid was "much nicer and prettier than DD's, no offence" 
I know it's all very petty but it's starting to really bother me. When 'friend' has no one to play with I.e older girl next door, she will come in for DD but I don't really want them playing together if she is just going to be so mean. It's a tough one though as DH and I get on very well with her mum and dad and our sons get on well too.
Any thoughts or suggestions on how to approach this would be great.