I have 1 hen out of 12 that seems to have allergies or a cold or something. She seems to be congested, her eyes are barely open. She is very sluggish and seems to seperate herself from the flock. She lays around all day but constitly gets up for food and water. She looks very sick, the rest of the flock seems as healthy as they can be. She refuses to roost at night and I have to put her up every night, I even built steps leading up to the roost for her and she will not even attempt to get up. She seems very very week. Oh yea she is a barred rock