I got a batch of 6 chicks from Tractor Supply 8 months ago. All were supposed to be Marans. 4 were. Of those 4, 2 were hens. One of those began laying at about 6 months. The other two hens in the batch (an Australorp cross and a Gold Lace Wyandotte) also started laying at about 6 months. The other Marans hen is now over 8 months and hasn't laid a single egg. The weather is still warm here - in the 80s most days, so I'm clueless. Is there something wrong with her?