Thank you for taking the time to answer so thoroughly, I appreciate it. Looks like I have the same keeping method as your sister, albeit with what looks like a smaller yard, but also a smaller number of chickens.
I was seriously questioning whether I should get new pullets. I fully admit I got chickens in the first place just because I like having them around. I live in California, where battery cages have been banned and all store-bought eggs and meat are at least "cage free," but pasture raised is readily available too, so I didn't need chickens for guilt free eggs. I just like them.
As you know, I approach questions in life from my zoological Illustrator background. Science plus a bit of the artist.