I've recently been doing a lot of research on wry-neck/stargazing/torticollis, because one of our pullets has been having seizures with her neck stretched all the way under her! From the pictures I have seen this looks like stargazing, or wry neck, to me.
From what I have read generally this is caused by a vitamin E, B-12, and selenium deficiencies. Though it can be caused by other things such as injuries, or mareks disease. We are giving our girl nutri-drench (a strong poultry vitamin supplement) to see if it will help her. I will let you know if it does!
We are also looking into possible acupuncture for her. We don't want to lose our girl either!!! I will let you know if we find something that works for her.
Best wishes to you and your hen! <3