I would leave her with the others, it's stressful on them to separate. If you treat for Coccidiosis, then I would treat all the chicks in the same brooder.I don't have a picture of her poop. I could probably isolate her tomorrow until she poops, I would like her to be able to cuddle with her sisters tonight. Looking in the brooder now I only see solid poops, I did see one earlier that was runny but brown..but it looked like a cecal(spelling?) Poop picture I had seen. I haven't seen anything bloody. I don't have Corid, I will go to tractor supply in the morning and get chick grit and Corid. Hopefully she makes it through the night She seemed fine earlier today. Thank you for your help.
There are several strains of Coccidia that affect chickens, only 2 of those strains present as bloody stool.