Sometime between yesterday and today, maybe 24 hours, my 17 week old white Silkie has lost all of the hair on her head. It is not bleeding and appears the hair fell out, she is down to the scalp. She is in a sizable coop with 3 other chickens. They have been raised together, all females, eating and drinking fine, etc. Nothing seems out of the ordinary. Has anyone has this issue before? If so, what should I do? Is this normal? I know I sound a little crazy right now but consider this is my first flock. Also, everything I read advised they should be laying eggs around 16 weeks. We haven't seen anything yet. Just curious how long can it take before they actually start laying. Thank you for any advice.