I'm new to this so apologies in advance! My 13 year old dd is feeling very excluded tonight. One of her "best friends" is having a sleepover for her birthday tonight. My daughter was not invited yet the rest of the friendship group was. The girl who's birthday it is simply told her "sorry, I can only have a certain amount of people". My daughter came home from school in tears as she only found out about it today. Any advice on how to handle the situation?