Is she coughing/sneezing?
Can you here any wheezing?
Is her face puffy/swollen?
Does she have a snotty nose?
Are her eyes free from discharge?
Does she have any injuries, could she have fallen and strained something?
Feel under her wing, is she hot? (compare with other chickens)
What are her poops like (look on the poop guide on here)
Is she eating/drinking.
Open her beak, does her breath smell stale(like something has died)
How does her crop feel/is it empty first thing in the morning
Is she still laying, if so could she be egg bound of have a softy on route?
Check around her tail feathers, can you see any lice/crawlies
Could she be cold/fed up with the weather?
Where is she in the pecking order, could she be getting bullied, is she being stopped from eating/drinking as much as she would like?
If you are really concerned, being a weekend should not stop you contacting a vet, they are available at all times
![biggrin :D](https://chat.allotment-garden.org/Smileys/green/biggrin.gif)
Good luck with her