I have 4 Isa brown chickens, 2 are 4 months and not yet laying, 1 is about 7 months and laying beautifully. My problem is our "old" lady. She is about a year old or a little more and has never really laid many eggs. She laid a few shelless ones when she was around 7 months, then only about 10 or so since then. We are now well and truly into spring, the weather is beautiful and days are long, but still no eggs from her. She has the same diet and everything else as the others, so I just can't understand why no eggs! Any ideas? Do you get chickens that just don't lay, or are there always reasons for the lack of eggs?