Just this morning, I saw that my Easter Egger rooster (who has a great dislike for this hen ever since she was aggressive to him when he was integrating into the flock), had trapped her in a thicket and was repeatedly pecking her on the head. I ran outside, intervened and brought the hen inside. As of now, she crouches rather than standing completely upright and occasionally throws her head back and/or falls over partly. She can eat and drink. Yesterday she was completely normal and able to fly up onto the covered run. I'm confused by this sudden wobbliness; could it have been caused by the attack or is it something else? I can add a photo if needed.