She may be a late-bloomer? If she seems healthy, she just may take longer. It is possible some chickens don't lay as much as others.
I have a very, very stingy Easter Egger. I get maybe 8 eggs a season, would you believe. She's lucky I'm a softy and keep her anyway, but it's frustrating. I love the color of her eggs and want to show them off, but I get so few.
she's healthy..and happy. Go figure.