My 37 week old hybrid mrs brown isn't eating for 24 hrs now hardly drinking , tail down very lethargic looking just standing on one leg or eyes closed laid yesterday but not today poop fine and looks ok everywhere else but feathers not shiny no mites crop empty and feels very light really worried put cider vinegar in water late today she is asleep in coop now with her two chick mates they are not bullying her but do seem to be avoiding her today please can anyone help we are new to chicken keeping but are very attached to our three ladies who e have had for 12 weeks