Practically everyone with hens in the northern hemisphere are seeing less eggs or no eggs from their formerly dependable layers. We are currently in the week out of the entire year with the least amount of daylight. Ten hours of daylight just is not enough to stimulate the egg producing hormones of most hens. Granted, there may be a few hardy "winter" layers, but they're the exception.
Out of nineteen hens in my flock, I have but a single hen laying eggs, and she's a new layer. I have three other "new" layers who haven't begun to lay yet because the amount of light is not sufficient to stimulate egg production hormones.
If you absolutely require eggs from your hens before the days begin getting longer again, try installing a 40 or 60 watt bulb set on a timer to come on two hours before sunrise. You should get eggs again within two weeks.