I have 8 chicks 6 weeks old, moved them out to the coop in there own cage with a heat light @ 5 weeks. all seemed well. took the lamp out last night, one seemed to be very week today. only the one. I went out this morning and she was laying in the corner away from the rest. I picked her up she was very dosile I put her next to the water , she drank some but still is all hunched over and week looking. I put the lamp back on and opened the cage so if they wanted to join the rest of the flock they could, but she is still not good. what do I do now?