So my three week white leghorn has always been very spunky and loves to fly at me for treats when I open up the brooder with the other three chicks. She was great this morning and when I came home this evening she had no interest when I opened the brooder top while the other chicks went crazy. She was pretty much alone and falling asleep standing up. I picked her up and she kept falling asleep. She has eaten a little that i have seen and did drink some water. She is just acting strange. I just checked on them and they all 4 are perched together sleeping. I am new to chickens so does this sound normal? I am around them so much that I feel like something is wrong. No other symptoms. They do have runny brown poop every now and again that is smelly but I have been told is totally normal. It happens more when they are excited to see me. Any advice?