Assuming all needs are met (good feed, water, stress-free environment) and they are otherwise healthy the limiting factors would be genetics, age and daylight. Not surprised the older girls quit laying earlier in the season but I feel the younger ones should still be popping out an egg or two if they aren’t molting. My second year hens have mostly all molted and quit laying, one or two early molters started back up but only one has continued now that the days are short.
Something I didn’t know, sometimes even first season pullets can go through a fall molt. I keep track of who is laying what and when so I noticed a handful of my younger girls stopped laying soon after starting up. Figured it was just a fluke and they decided to take an early break, then I noticed those few looked a bit scruffy in the neck area. Missing feathers and now they have pin feathers on the neck and head. Google suggests it can sometime happen. The more you know.
Also, it may be worth going on an egg hunt if your girls free range. My pullets were nuts last year and were laying in really hard to find spots. Only figured it out because the dog would bring up frozen eggs.