It also could mean she got lucky on one test. I"ve read many posts on this site about kids scores dropping when they get older and it's always the teachers fault. Maybe it's just the way things work out. I know this is a simplistic example but when I was in kindergarden I was the tallest kid. I was going to be a basketball player. I ended up 5 ft. 8 in. More my point is some kids just peak earlier than others.