Thanks for the response. I have had her under a heat lamp and separated for three days now. She is now seeming fine, and I returned her to the coop. But now the other girls are pecking at her and she is hiding. It rough out there!If you're implying if she is a danger as in spreading a sickness, I would say no. Because if one has it, they all have it. One may just be showing symptoms if they're stressed or have other things going on.
Basically all birds have Coccidiosis-they're carriers, but they won't always show signs because it hasn't become active. Which is usually caused by stress, like adding new chickens to the flock or moving them, things like that.