Girls stop growing in 7th and 8th grade. She has no advantage. Get over yourselves. For all you know she has a learning disability like dyslexia which required an extra year of kindergarten. Or maybe she was speech delayed and not ready for 1st grade. Whatever the reason, it sure as 💩 is none of your business and if you care that much about a girl who will now be playing against older girls for the next three years, then you sir are the sad one.