You've never been around girls have you?
I'm 31 now and had a group of girls from 1-8th grade, our leader stole a car and died in a crash, we broke the group after that and found new friends.
Girls will always do a pack mentality things. They may rotate to a few different groups while discovering who they want to be in grade school, but usually know their group type by 6th grade. You always want a brains, brawn, flirt, liar and leader. Liar was the power house because they could get the rest out of trouble by being a good kid in class while raising hell on the playground.