Slifer used to do that when I put her muzzle on... Is your chick look like she's wiping her nose on the ground? Is her head up?
It could be just her! Some of them have some peculiar things that they do. As long as she's eating and drinking well and her ploop looks normal, then she's fine.
i think thats called vertigo. shes eating too much worms or just really hot sun. does it fall down a lot? if so its definetly vertigo. put some ice on its head give a dessertful of castor oil.. though it may give it runny poop. feed it vegies and keep it in a dry place. make other fowls excersize including ur chicken wen it recovers.