It's nearly 6 AM here, close to my (don't laugh) normal bedtime. I'll try to hang in there until I get to hear you managed to get those liquids in her, and maybe a temperature. If you don't hear from me, though, hopefully someone else will pitch in in a couple of hours. Just know that the most important part right is getting those fluids, electrolytes, and vitamins in her as fast as safely possible. After that, while you're waiting, get her settled into a crate or box or something comfy, and install her in your tub or something to contain any messes. Come morning, you can scramble some eggs, toss some garlic powder or crushed fresh garlic and some cayenne pepper (crushed, fresh, powder, whatever) into the mix while you're mixing it up to cook in, and the garlic and cayenne are both good for getting the energy levels up and strengthening the immune system. That, because even if she is 100% illness free currently, whatever she has going on is liable to be hard on her immune system, and we need to try to get her strength up before any bugs move in on her system.
OH!! It completely skipped my mind when I was listing things to check... that's why multiple heads are better than one...
Feel along her breastbone, her keel, and see if there's lots of meat along both sides, or if there's just a sharp, pointy keel bone sticking out and hardly any muscle either side, which would be a sign of being really underweight. Also, you need to check her feathers around her cloaca and underbelly for signs of feather lice (if you can't see anything crawling around, look for white crusty blobs at the very base of the feathers, right where they go into her skin. If theyre there, those are feather lice eggs). Also keep a watch in your coop(s) for mites, which are tiny little red parasites that are fond of chickens, too. And once you get her energy built up, you might need to worm her, in case that's what's dragging her down.