Chick only using one leg

[hiddenhollow]

Hi, I have a three day old chick who won't stand on one of her legs. I don't know if it is broken? I didn't notice anything wrong with it when I first got them (they arrived in the mail and I checked them all over pretty well). She seems healthy otherwise and will eat and drink but the poor little thing has a really hard time walking. She can't keep her balance. Her toes on that leg are curled up. I am not sure what to do to help her. Any suggestions?