We got our chicks in yesterday. All day yesterday they were fine, doing well, running around. I checked on them at 1:30 am before I went to bed and all were well. I got up at 7 to check on them and my little Sicilian Buttercup is sprawled out under the heat lamp, won't get up, gasping, won't open her eyes. I picked her up gently, and even then she's still sprawled, gasping, eyes shut. This was my most shy of the bunch yesterday, would hide, would peep LOUDLY when I picked her up. I moved her to a separate brooder because one of the other chicks pecked at her when she didn't get up, with food and water. I had my chicks vaccinated for Mareks, if that information matters, and all the chicks came from the same hatchery. Said hatchery isn't open yet for me to call and ask, and I don't know if she'll be alive still by the time they are open. What can I do? What should I look for?