I actually have a similar problem with one of my hens--maybe it has been going around a lot lately...yikes! U should isolate her immediately from the other hens (and rooster if u have one) I u go to the search engine of BYC and search "Ryan A" (my profile) u will see a thread I made yesterday called Varicella chicken--help! I accidently said Varicella, but I meant Marek's! I think our chickens have Marek's disease and that it is spreading like Covid! PLease do what I said about isolating her because that is pretty darn important so that the other birds don't catch it because Marek's is super-duper contagious! Over and out!