I have a 8 week old chick, vaccinated for mareks at hatchery. Has been what seems like involuntarily swaying her neck. I’ve looked up wry neck and symptoms don’t seem the same, her neck isn’t going underneath her legs or staying to the side. She gets layer crumbles still and is still in brooder but we bring outside weekly. Attached is a video that’s not great but shows what she’s doing. Not sure if this might be a crop problem? Any ideas?