Why Did One Hen Stop Laying?

[cltchicken]

I have three chickens right now, all two years old (Easter Egger, Silver Laced Wyandotte, and a Delaware). This spring, after it started warming up and the days started getting longer, they all started laying again. The Easter Egger laid for about four weeks and then suddenly stopped laying for about a week and a half. Then! She started laying again, but only for about two weeks. Now, she is back to not laying eggs. Does anyone know what is going on? Help! She still goes out and scratches in the dirt during the day and roosts with the other girls at night. She looks healthy and has plenty of water and food. Thank you so much for your help!