My little DD is nearly 7 and is a very kind and sensitive soul. She found a best friend last year who she went into this current class with. This friend has found someone else and my DD is heartbroken. DD is sensitive but even I witnessed her friend blanking her and running to the new friend
.
She has cried herself to sleep and doesn't want to go to school tomorrow.
Why are little girls so mean to each other? 
I don't know what advice to give her as she worries so much about making any one else feel "sad" that she won't stick up for herself. 