I decided to try chickens this year and got 2 RIR, 2 welsummers (one of which turned out to be a roo) and 2 Marans. One of the Marans has not laid an egg. The only difference between the two is that the non laying bird's comb flops over and is not as bright red as her sister's. And she is fat! Eats but does not put out... Any clues as to how to get her started?