We have a cochin hen who began laying almost 3 months ago. She laid just about every day or every other day. Then a little over a month ago just STOPPED. Nothing changed. No food change. She doesn't appear sick. No birds in or out. We can't figure it out. Luckily, our barred rock began laying about a week ago, but we're pretty frustrated that our little banty cochin has just stopped inexplicably. They only get scratch out in the yard about once a week. I've upped their protein, she has oyster shell. what gives?