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Oh my sorry to hear that.
The only i have herd of the crowns turning dark in color is either frost bite or no or very bad air circulation going through the body.
Keep an eye on your girls, if you see any acting up keep her separated from other with your care. Just to boost the sick ones give a bit of sugar in the water.
I am sorry that i can not help. Good luck with your other hens.
Oh my sorry to hear that.

The only i have herd of the crowns turning dark in color is either frost bite or no or very bad air circulation going through the body.
Keep an eye on your girls, if you see any acting up keep her separated from other with your care. Just to boost the sick ones give a bit of sugar in the water.
I am sorry that i can not help. Good luck with your other hens.