I think she has wry neck and your vitamins did the trick. Keep in mind that wry neck is a symptom--some chickens with Mareks do get wry neck, and some do not. Same with the eye problems--some get it, some don't.
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Check out the link in post # 3. Confining in a crate to keep quiet and undisturbed by other chickens is necessary sometimes.What happened? Is she fine now? My chicken has the same thing! I just started the vities et al.