Sorry for the delay, but I just got your message ...
If the yellow is the result of an increase in coloration, then poor egg production or 'high pigment intake' can be the cause. If it's the result of a loss in coloration, then anemia, deficiencies of iron, copper or vitamin B12.
A much closer inspection might provide a few more clues ... check inside her mouth, around her tongue/throat for any blistering/crusting/etc. and inside her upper beak for any sign of infection. Look at her eyes for any differences from one to the other, or her own from others of the same breed. Esp. if you have siblings, it's a good idea to compare 'em side by side. Check 'em all really well, and actually handle each -- see if any seem surprisingly light. And, watching from where they are unaware, you might see behavior that indicates she ain't all alone in this.
I've gotta agree w/ casportpony, to whom I say, "I'm a guy." I prefer permethrin over sevin ... don't much care for usin' it, esp. when the standard garden/poultry dust works most nearly every time.
You might wanna begin givin' pellets along w/ the corn. First, I'd be concerned about nutritional deficiencies catchin' up w/ 'em, and second? I worry a bit about aflatoxins, knowin' that it's been an issue for so many folks this season.
You could be dealin' w/ the bird w/ the most worms ... if they're not molting, then I'd consider worming the entire flock w/ fenbendazole, but at the minimum rate of 20 mg/kg for three consecutive days, that way all worms will die (unless there's tapeworms, for which I'd switch to usin' albendazole, instead ~'-)
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