Is she eating, drinking and pooping ok? Is she acting differently (feathers fluffed, keeping to herself, etc.)? If she's of laying age, is she laying same as usual?
More information would be helpful. Hopefully, all is ok.
Has she been more vocal than usual? I actually started a thread about one of my chickens ‘losing her voice’ because I could not find any information about it on line and yes, it can happen. Note: I am not ruling out an issue, just providing an alternative suggestion:
I hope you enjoy being a BYC member. There are lots of friendly and very helpful folks here so not only is it overflowing with useful information it is also a great place to make friends and have some fun. Unlike non chicken loving friends, family and colleagues, BYC’ers never tire of stories or pictures that feature our feathered and non feathered friends