I have a sick chicken and don't know what to do. She is approximately 16 weeks old, and is a probable cross between a Cream Legbar and Bielefelder. She is drooping her tail, her poop is pretty much just urine, and she has no interest in eating. She is drinking water somewhat and the only thing she seems to want to eat is oyster shell and some grit. She did peck a few bites of oatmeal this afternoon. She will walk around, but is just not interested. I have added electrolytes to her water and soaked her bottom in warm water, just in case that would help. I just don't know enough about all this to know what else to do, as I've had chickens for less than a year now. After much Googling, I'm still at a loss! So any help or advice would be greatly appreciated. I have added a picture of her from just a few moments ago.