I have seven 6-week old Brahma chicks and this past weekend, I found one of them sprawled out and unable to walk. At first, I thought she (I'm pretty sure it's a hen - they're so young, sometimes it's hard to tell, but she's feathering in like a hen) was just resting but when I tried to get her to walk, she would try but then fall over. Sunday, my husband found her lying on her side. I separated her, but she is still not using her legs fully. She's eating and drinking and her poop's normal. I have the 911 rooster added to her water and I just dosed her with a vitamin and electrolyte mix tonight as well as fed her some boiled egg yolk. When I pick her up, she has some push in her legs, but she can't hold her weight and falls over and seems fatigued. She chirps and when I talk to her, she opens her eyes and they're clear. The other six chicks are fine and don't show any of the symptoms. I only started raising chickens this summer so I'm fairly new. But she doesn't show signs of a virus or infection, to me. I don't know what else to do for her. Do I just keep dosing her with the vitamins and see what happens?