She is only 1 1/2 years old. Was not being pick on by anybody. Our coop is very large plus they can go outside every day. One of our good layers. We have fed a complete layer crumble from North 40 plus they have free choice of oyster shells. Sometimes I would treat them with cracked corn and black sunflower seeds. I just made a video for you and I’m trying to figure out how to get it on you tube.
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She has been like this now for at least a week and not getting any better.
Upload your video to youtube, then provide us a link.View attachment 1640099
Can’t seem to get the video to down load but this is the position she just falls into when I let go of her. She will fall to either side same position.
Have you added any new chickens to your flock recently?
She's been like this for a week - does she have any bloat/swelling or fluid in the abdomen?
I would get some poultry vitamins into Poultry Cell would be good if you have it (1cc per 3 pounds of weight). Also calcium form 3 days - 1/2 tablet of Caltrate (or store brand)
Have you felt to see if there is an egg inside her again?
My best guess would still be that she has Marek's or she may have a reproductive problem with something pressing on the nerves.
As suggested by Eggcessive, you can also try a sling to help keep her upright.