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Breeding for resistance is the best defense as realsis said, Marek's is everywhere. If your hens don't succumb, perhaps raising chicks from them is the best you can do as they may be genetically resistant. Just my opinion.

At a minimum, I would separate her. Perhaps not a bad idea to clean out the coop and ventilate it. If the symptoms are the same and she goes downhill there's probably no need for a vet, just cull. Good for you for getting a necropsy though. Don't beat yourself up though. I've never...