Since days are shorter she may not start laying again until spring when the days get longer. She may also have started molt, which will also stop laying until it's complete. Time off from laying can vary greatly from bird to bird, and usually gets longer the older they get. As long as she is otherwise healthy, then worst case she should start back up in spring. The older they get the longer it takes to form each egg also, so the frequency of laying will gradually slow down as they age, until they stop completely if they live long enough. At 2 1/2 I would expect she'll still lay if healthy.