Witnessed two school friends of DD try and wind her up this morning.
I help both parents of these two by taking one to gymnastics and walking part way home with the other. I know they're quite pally with each other more than my DD which is fine. DD has other friends and doesn't seem bothered but she was bit disappointed at not being invited to a birthday outing of one of them this weekend. She asked her yesterday quite innocently if she was going to be invited and the answer was 'no'. I spoke to DD about it later and said not to bother etc. etc. This morning, the two girls spotted my DD as soon as she walked into the playground, they said something to each other, ran over and bday girl started saying to DD how much she is looking forward to spending her bday at the zoo with said friend. Then they seem to wait for a reaction from DD 
I cried all the way to work. I know I'm a wuss and it's just kids stuff but why do they have to be so mean? :( Fortunately, DD didn't seem bothered. I was bullied at school and always felt like an outsider so it hurts to see DD being treated this way. I know this sounds like I'm being pfb but she's a very caring child who always puts other kids needs first as her teachers tell me.
Not sure what I'm asking for really - maybe some ideas as to how I can help her if it becomes an issue. Thanks!