my 12 year old daughter has had 3 close friends since they were in primary school , theyve all gone to each others houses , parties , sleepovers etc , 2 out of the 3 girls have changed a lot since starting high school , they have been treating my daughter and the other girl not very well , my girl got fed up with this and has been having her breaks with some new friends at school she asked the pleasant girl to go with her but she didnt feel ready to move away from the set , this has been fine and all seemed ok i thought it was just a case of outgrowing each other , i have invited the girls to my house and they all come about 2/3 weeks ago and had a lovely time i was delighted things were going well. however the 2 who have changed have gone back to each others without inviting my girl or the other girl and now 1 of them is having a birthday party and invited lots of children except my girl . I CANNOT BELIEVE this girls mum would be so cruel and do this to my girl but hey ho i suppose not everyone is that honourable , any tips on how to deal with a situation like this , thanks for reading xx