Hi One of my hens are sick. Her tail is pulled to one side. One eye is sometimes closed (no excretion in the eye) Her head also goes to one side, then she pulls it back. Like an involuntary movement of the head? I've had her in isolation for about a week now and gave her some charcoal flush, but since I'm not sure about the dosage, I don't think I gave enough. Any ideas as to what it can be?