I have three hens that are 10 months old. They have all been laying and suddenly, the cochin just stopped laying. The other two are continuing to lay. The weather has been beautiful. She is getting plenty of sun. She is not molting. She's eating well. I supplement their feed with vitamins. They have all been wormed. They get plenty of calcium and protein and I use a layer crumble - I have oyster shell in the run with them. Her comb and waddle are nice and red, eyes shiny. She doesn't have the appearance of being sick or out of sorts in any way - but she has not laid an egg for six days now and she was laying at least four per week. They get plenty of protein and I give them greens each day. Do they go through a down period? Is this something I should worry about? Anything special I should be doing for her?