I have a 7 month old RIR. I noticed a couple of days ago that she was acting funny. She would hide in the corner of the coop by herself and almost always have her eyes closed. She normally flocks to the hen scratch that I throw out to them but she was completely uninterested and has remained that way. She doesnt seem to be eating at all. Shes very lethargic, stumbling around when she does attemt to walk which isnt often. Shes also doing a weird jerking motion with her head and when picked up she lays her head completely back onto her body. Her comb isnt a bright red like it normally would be and almost seems "dried up". I felt her body to see if maybe she was binded with an egg but from what I felt theres nothing there. I could be wrong and just not know what exactly Im looking for though. I have been giving her water with a syringe and she does drink some. Ive seperated her from the other birds in a seperate cage inside the coop with food water and a heat lamp. She doesnt seem to have mites or lice and it doesnt seem to be respiratory as she isnt showing the normal signs involved with that. Im at a loss and have no idea what could be wrong or how to treat her. Any advice would be greatly appreciated.