I had one just like this today. I drove to the hatchery to pick them up instead of having them shipped. I gave sugar water and spent about two hours holding her in my bra to keep warm, and every five minutes or more giving her a drop or two of the sugar water on the side of the beak with a syringe. She seemed a little perkier, so I put her under the broody hen. I don't know if she'll make it, but I figured it was worth a try, given that the mama hen can keep her warmer than I can and she'll have the social contact to keep her from getting stressed. Please let us know how your little one does.
Traci