Is my chicken ok?
- Monkey Lookout
You should be able to tell if its sour crop by smelling her breath - if it smells, well, sour then it is. If so, then this link should help http://www.backyardchickens.com/t/613861/how-to-treat-sour-crop.
Its perfectly normal for a chicken to have an empty crop first thing on a morning BTW.
I'm sure the experts will be along soon to help you out.
All the best