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Are her eyes clouding over? If so, it might be a sign of marek's. Possible eyeworm could cause eventual blindness as well. Supposedly, you should be able to see the worm in her eye(s).
There's a few things that could be wrong...but wry neck and marek's doesnt sound like one of them. Keep it simple: First, visually inspect her for lice/mites. You can see them crawling, lice are faster, mites slower and look like tiny black or red dots...like pepper. Check around her vent area...