Please Help! Hello, I have a 1.5 year old standard Buff Brahma hen. This morning, when letting the flock out of the coop she didn't come out. Instead she stayed on the perch shivering with her eyes closed. It was 55 F out. Thinking maybe she was cold I brought her inside and put her in a heated room in a hospital cage. She didn't open her eyes for the entire time. She didn't respond to anything except shaking her head when I tried to hand water her. The other hens seem perfectly normal. Here's what strange: There is absolutely nothing wrong with her... not egg bound, no parasites I can see, normal poop, no injuries, normal day, etc. She almost acts like she has vertigo. If you watch you can see her eyes behind the lids rolling into her head and her head pan to the right slowing every few seconds. But she doesn't seem to have a loss of balance. She gapes and seems to have a gag reflex the couple of times she opened her eyes. It's been seven hours and she's no better. PLEASE HELP!