Give the chick poultry vitamins by mouth. SaveAChick or other brands are good. Even baby vitamins, such as PolyVisol without iron2 drops daily. Google "curled toes in chicks" and look for The ChickenChick.com or many BYC threads by searching at the top of this page.
I have read that you can cut a fairly large bandaid to remove the non adhesive and you can uncurl the toes and place them on the top and bottom of the uncurled feet. Which leave her with little duck feet! Never tryed so I don't know but it comes from a highly valued source!