I have a pullet who over the last week started sleeping under the coop at night instead of going inside, her comb is shriveled and whitish and she has runny poop that is all over her rear end. I don't notice any sneezing or coughing, and she's still eating/drinking, but she is staying away from the rest of the flock and generally just not acting the same as she was. I went to the feed store and they gave me Terramycin- is this what she needs? I love my local feed store people, but the lady I talked to doesnt have alot of experience with poultry and she's given me misleading advice on several occasions. So do I give my girl this, and if so, how much? How much should I put in a one-gallon waterer? It says 200-400mg per gallon and unfortunately, I have no idea what that converts to for like tablespoon/cup I have her in a "sick coop" by herself so I dont have to medicate the other girls. The meds say not to give to any chickens that are laying eggs for human consumption so I dont want to medicate them unless I need to. Any advice??