Well I'd go ahead and medicate her and tuck her into bed. Might dose her again during the night, sure can't hurt at this point. Do you have an avian or exotic's vet near you that could see her? I hesitate to suggest that because I've been that route before. It's a lot of $$ for a lot of...
Won't hurt to bring her inside. If she's feeling crummy the warmth won't hurt. Is she by any chance drinking a lot of water?
Edited to add:
Was going to say too, when you mix up the meds don't wait for her to go and drink, use an eye dropper or small, needless syringe to give her some...
If you can get it tonight then I'd go ahead and use that. I just don't know the dose for it. Do a quick search on this forum or Google it, should be able to find the info. Good luck, hope she does ok.
I prefer Corid, much gentler on the birds. You can use Sulmet, it's just very harsh on their systems, something they don't need if they do have coccidiosis.
As far as the Corid, I get the 20% water soluble powder from the feed store just because that's what they have, it seems to be the...
Chickens with coccidiosis defintely can look fine one day and very ill the next. I had a 3 year old hen looked fine in the morning, was hiding in the nest box by afternoon and dead that night. She hide her illness until she was so sick she just couldn't do it anymore.
It wouldn't hurt to...