I have a three-year old girl that has been a good producer for me for the past two seasons, but she recently has stopped laying entirely. About three weeks ago, she layed a soft-shelled egg, followed that up with a perfectly normal egg the next day (though there were some rough spots on the shell), and then just shut down completely. She sits on the nest almost every day, but to no end. Her other three coop mates continue to lay fairly regularly, if not at quite the rate they all did earlier in the spring. Their food, environment, and all other potential stressors I can think of are all unchanged in the past two years. Anyone have any ideas as to what is going on here? Thanks in advance for your thoughts.