My sole remaining Swedish Flower hen is suddenly isolating herself from the rest of the flock (noticed it yesterday early). Her chest is enlarged and I was worried about impacted crop but she is empty, apparently not eating much. Immediately after I put her down, she puffs up her chest again. I can see her take (try to take) deep breaths. A bit of head shaking and occasional open mouth breathing. Small discharge from nares (one side only). So many respiratory illnesses but how do I tell what to treat if I don't know the cause? I am pretty new at this...spent $500 on vet bills for one of my Sapphire Gems treating with antibiotics for a month before she finally died. I can pull "Inga" out of the run but still have no idea what to do after that. Help?