hello. i have a chicken called Annie. she is suffering trouble. well, i cant post a pic to show her symptoms of course but i can write them down here. well, she is losing feathers (now tht has come to a pause for a while). she sits on the nest box day and night. the temp is not to much or too low. but some lucky days, like today, she is active but her eyes seem 'sleepy'. she doesnt' go out with the flock. she eats but seldom eats her appetite. she drink but seldom drinks her thirst. she is sick. i have no clue what is the matter. now, since she is real old, could it be she is suffering due to old age? thanks.