I don’t think this is Newcastles, but wry neck and possibly fowl pox. I would get her eating and drinking right away. If you should lose her, then send or take her body off to your state vet lab for a necropsy and you would then get a diagnosis. A body should be wrapped in plastic bags and kept in a cooler on ice (do not freeze) and taken to the state lab asap. Here is a list of state vets to contact if she dies:
https://www.metzerfarms.com/poultry...L5h4Xt137GBu32pWJZSRUY5DYhQyVrd4ODmF-Ab8otocc
Upon a second look I do agree with it possibly being fowl pox with how the face looks. The reason why I said Newcastles is the combination with the sudden neck issues and the two poop photos attached. Particularly the second one as poops like that are symptoms of new castle.