Does she have any other symptoms?
She could have something stuck in her crop?
I had some sick birds awhile back and it started with a raspy-ness and it turned into runny noses and what I think was infectious coryza, and in the end they all got it and had to be put down
If you can, I would separate her until you know what you're looking at and give her some tylan, just as a precaution.
Though I may be prone to over-reacting...
What breed is she, she is very pretty!!!
No other symptoms. How could I tell if she has something stuck in her crop? All 3 hens came from the same place...I got them together. She's an Olive Egger.