My best friend since kindergarten doesn't want to be friends anymore:(?

[Mia]

Well if she is really your friend, she'll get over it.
If she doesn't, just forget about it. A good friend doesn't do that to her friend.
She'll probably get over it soon. But you should talk to her. Remember to stay calm, and don't start saying things you will regret later!
When people say, "You've changed," you haven't, you just stopped living life their way