I have a 5 week old faverolle pullet who as of this past week seems to keep her head tucked a lot. Tonight I caught her sort of tucking her head and running backwards and she twitches some as well! She eats and drinks fine. But just seems to keep her neck down a lot. I have a lav orp and brabma and she seems to be the slowest tk marure of them. Can someone help me figure this out?