There are various respiratory illnesses that can befall a chicken, more info is here:

http://msucares.com/poultry/diseases/diseases.html

The cause could be bacterial, mycoplasmosis, infectious coryza...try to narrow it down by matching symptoms and suspected causes. Sulmet (a liquid medication with a sulfa base) can be added to their drinking water for some of these conditions. If you can, quarantine the sick bird and think seriously about treating your entire flock.

Velvet ~:>

She does not seem to be as acute as this site describes. Still, I have started my flock on Sulmet to see what happens.
Someone suggested that she might have something caught in her throat. Has anyone had a hen that this happened to?

hows the chick doing now and did you find out what the problem was?

She was doing well after her treatment of Sulmet. But in the last two days she started "honking" again and sort of sneezing so I put them all back on another round of Sulmet for a couple of days. There doesn't appear to be anything stuck that I can see. The rest of my flock is just fine so I am really perplexed. She seems fine but may have lost a little weight. I guess I just have to wait and see. I hate it when one of my girls is off.

Tonight when I let them out to free range the rooster is going after her big time - first I thought he was trying to mount her but then he is just pecking and being mean to her. She just lays there until I intercede. It was okay for while and he has done it again but this time a few hens join in the pecking. So now I have her seperated and she is wheezing badly but it's pretty hot 80+. I don't know what to do for her. I will put her on the roosting bar after it's quiet. MY DH is out of town and I don't have the courage to put her down myself - I can't let her suffer. Any words of wisdom here?