That sounds neurological - like Wry Neck. This can be from injury/head trauma, vitamin deficiency or disease like Marek's, Newcastle or other's.
Check the ears to make sure they are clear. It's possible it could be due to vitamin deficiency - provide her with Vitamin E and B vitamins - the eggs will take care of the selenium.
Check the ears to make sure they are clear. It's possible it could be due to vitamin deficiency - provide her with Vitamin E and B vitamins - the eggs will take care of the selenium.