Hello, I just recently started caring for two chickens. Have had them for about 1.5 months. Just yesterday one of the chickens started looking and acting sick, but not sure what is going on. Her comb is very pale, she is barely eating or drinking. Mainly just stays in one spot. I did notice her shaking her head from time to time. She also has diarrhea. I’m very new to raising chickens, so need some ideas on how to help her. Thanks