Help! My 3 yr old is a bully

My three yr. old daughter is the playground bully. I’m not sure where this is coming from! We don’t discipline with spanking or yell at her but she is so selfish when she is there. She yells, “go away kids!” or “You can’t play on that swing, it’s mine.” She seems to understand about sharing and being kind when we talk to her but when she hits the playground the claws come out. How can we get her to stop?

Girl drama

I volunteer in my daughter’s Brownie Troops and some of the girls are such little divas! This is the opposite behavior we are trying to promote. They are critical of each other but more hurtful is when they are whispering about a loner in the group. I don’t want to just tell them it’s bad to talk about others that way. I would like to inspire them to think about it and change this on their own. Any suggestions?