My 12 week old Americauna, Molly, is coughing. She sounds like a goose honking. She periodically breathes with her beak open, and stretches her neck. She is eating and drinking a little but has definitely lost weight, and her crop seems empty. Her stools look normal. She will not fly up to roost. She has been living with her 16 chicken friends in a protected run and 6x8 coop, but is currently quarantined in the garage. The other chickens do not seem sick. I looked in her throat but do not see evidence of gapeworms (though I am not sure what to look for...) Does this sound like a cold, or do I need to treat her for respiratory illness and gapeworms? What medicines does she need, and how much should I give her? I appreciate your help!