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I had one do this; I really don't know why, but it went on so long I considered culling her. I am so glad I didn't, because the next year she was absolutely fine, and has been ever since. She's now 5, and still laying >100 eggs (good eggs!) per year :D

You say she's been laying consistently since last year, is active and looks healthy, so I would guess her bodily resources are running out (which happens whatever she eats) and she's heading into a well earned break (and molt). You are providing calcium and she should get plenty of vit d through...