If you're friends with a vet student, or if you're up to mailing her to a lab, you can have a necropsy done if she doesn't pull through -that way you can know for sure what did her in, and if it's preventable you can take measures to protect your other chickens.
Either way, I do hope things go well. It's never easy when a beloved animal is suddenly struck ill. :aww
Either way, I do hope things go well. It's never easy when a beloved animal is suddenly struck ill. :aww