I have a 7 month old EE girl who is doing EXACTLY what the hen in the video does- walking backward repeatedly with her head down. (My video would not load).
Shes last in the pecking order, gets pecked often, and keeps to herself quite a bit.
I've checked her over, no bugs, ears look fine. I've upped protein and added Sav a chick to the water.
She is the only one of 6 who does this. I had an EE several years ago who was like this and the other chickens took her out one night

Is it neuro? Anyone else deal with this??