One of my leghorn hens was standing in the coop last night. She is usually very flighty, and won't let me touch her. Now she is not responding to anything I do. Her eyes are mostly closed, and she is slightly wobbly. I checked her vent, and it looked fine. She doesn't have mites. Her poop looked a bit runny this morning. She is currently in a dog playpen that I use for chicks and some adult birds. I dipped her beak in water and she drank a couple of beakfulls, but the food looks untouched. I have no idea what's wrong with her. Please help!