We have chickens that stop laying all the time, sometimes change of weather can cause the lapse in laying, stress also can cause it. A couple of years ago we had a hawk problem, a hawk would come and take a chicken nearly every day. During that time, the egg production of our hens slowed down because of the stress they were feeling. Another reason, is if a hen is hatching she will stop laying. Some hens won't become broody or sit on a clutch of eggs during this time, but they wont be laying eggs. If she is otherwise healthy I wouldn't be too concerned.
