I will check her sternum and throat in the morning. She is still eating and hanging with the rest of the flock.....but occasionally still moves her head back. I will check those things tomorrow. Thank you so much!
I'm sure she will eventually stop doing the thing with her head. I don't know much about chickens' health yet because I'm new and I haven't brought home my chickens yet, but I'm sure that as she fully recovers she will act normally again.