oh bless her, she doesnt sound too well

in these situations the temptation is to do too much out of, understandable, desperation... keep her indoors, somewhere warm and separate from the flock, make her as comfortable as you can. I've never used corid before, when my chicks had coccidiosis, I had vet prescribed baycox, I cant comment on the corid use... Her breathing sounds strained/laboured to me, but not gurgly, it's hard to tell without being there first hand. If you think its gurgly or phlegmy sounding you could give her some doxycycline or whatever antibiotic for respiratory infection you have, check you can give her this along with the corid, some meds you cant mix. Alternatively if you have vetrx, mix some into a hot bowl of water and let her breathe in the steam for 10-15mins, I always find that helps to relax my sick chickens. The only other thing you can do for her is tube feed her a feed for critically ill omnivores or give her little food balls as someone else already suggested, if she hasn't been eating that could give her the boost she needs to keep going. Keep her hydrated, it sounds like you're already doing everything you can for her.