I have a McMurray Dominique that is 12 weeks old and has developed a crooked neck. She has no other symptoms. She continues to forage, she comes when I call (I'm my flock's rooster), she eats and drinks. She is not pecked by the other hens. Everything is normal, except he bow in ther neck. It is C-bow to the left side. Her head is still oriented normally. She has no swelling, cuts, abrasions or obvious deformities aside from the bow neck. Any ideas? This occured over night.