Around April 4th one of my hens started having trouble breathing, out of all 9 of the hens she was the only one with issues. I separated her immediately when I noticed this but that was a month ago. She hasn’t produced any eggs either within the month and hasn’t had any progress with breathing. She is eating and drinking just fine, I go out and give her some treats that the other hens get so she doesn’t feel abandoned. Her eyes seem clear and there is no discharge anywhere. I am worried that she might be lonely out there by herself and I would like to put her back with the others. Do chickens get allergies in the spring? Would it be a good idea to put her back? I don’t know what to do and I don’t wanna drop money at the vet.