I am guessing, maybe a smaller dog tried to "play" with her by grabbing her neck? So that is why I am worried it is injured or broken. She did not look this bad at all last night.... but she may have still be working off adrenaline.
So I found my Black Australarp injured last night, I think it was one of the small dogs around here. Anyways it just looked like her feathers were pulled out around her neck and a few scratches. I cleaned her up and put her with her nesting buddy for the night, I figured it would calm her down...