hi so i was out doing my chicken chores and i seen my one year old barred rock standing there kinda puffed and eyes closed and then she tryed to poop and black and white watery poop came out and then she went to sit next to a gate and just sat there with her eyes closed cold it be that she has not had any oyster shell i give them grower feed so my chicks that live outside do not get any layer feed and i dont give oyster shell i make them egg shells but i have not for a while i have not had the time but i am about to make some right know what could it be please help ASAP i dont know what to do 
