How old is she?
Eating & drinking?
What conditions is she kept in, i.e. coop with other birds (how many birds how large a coop) free ranging. What are her poops like? Normal, runny, foamy?
How does her crop feel-normal, hard, squishy?
Does her breath or vent smell bad?
Has she been wormed?
Is she walking with her tail up or down? Walking at all?
If she's with other birds, are there any new additions to the flock?
Are the other birds looking healthy?
Sorry for the "20 questions" but things like this help folks try to help you.