hen stopped laying, but why???

I have an EE that is about a year old and she has stopped laying. I was having some trouble with her hiding her eggs outside the coop in the woods when they are let out to free range, but lately I haven't found any eggs anywhere from her. Last week they stayed inside the coop for 5 days and NO eggs from her, so I think if she was laying she would have layed during those 5 days, wouldn't she?