I have a RIR hen who has been loudly wheezing for a couple of months now. I've tried a couple of antibiotics, to no avail. A couple of times she had a little yellow mucus in one eye but the antibiotics clear that up. But the loud wheezing is not improving. The weird thing is that this hen has an extremely good appetite and has a lot of energy. Also, my other hens have not caught what she has. I would never know she was sick except for her loud wheezing. Any suggestions on what could be wrong with her? Was thinking about making an appointment to see the vet.