I have 4 red stars. 8 hens total. Today, during free range, one of the red stars was sitting in woods alone with tail down and sleeping. I found that odd. I picked her up and put her back in run. Later, she was doing same thing in the run. I picked her up to investigate. She was lethargic. Her heart was beating really fast and hard though. I felt around for egg binding, but I didn't feel anything. Although I am very very new to this, so I am not sure what I would be feeling, but I didn't feel any lumps on either side of vent. I took her back out to coop and dipped her beak in water. Her head was limp so I pulled her back and noticed that her head was very droopy and she was having a hard time holding it up. Then it went completely limp and a few moments later, she passed. I am baffled and so sad. What happened!??!!! She only showed symptoms today. Mites/Lice-NONE. I am SURE of this. I checked throughly. Girls dust bathe everyday. Worms/parasites-She was dewormed as a precaution in Sept. No evidence of parasites. Cocci-I saw red droppings a few months ago and preemptively treated everyone for cocci then. No more red droppings. The last few days I have noticed that someone was dropping water-y poop but I have been unable to isolate who it was. Watery with green. But everyone is acting chipper-eating, playing, laying. Except for her today. Oh please help. She is from mcmurray so vaccinated against mareks. It was just so sudden. ????!!!!