Could mamma raising chicks in coop along with her being broody really keep them on egg strike??
I have never experienced that, though with living animals you should never say never. Still, I'd be very surprised if that would cause any pullets or hens to stop laying.
4 weeks now no eggs from 6 of my hens. (Olive Eggers and crested cream hens) 7 other hens still laying regularly.
The main reason they stop laying is the molt. While many pullets skip the molt their first fall/winter and keep laying (though often somewhat reduced) it is possible for them to molt. Are you seeing feathers floating around? Some chickens molt quickly and can have bare spots but others molt so slowly you can't tell they are molting just by looking at them. Extra feathers flying around is often the best way.
Another common reason is that they are hiding a nest from you. They can be pretty clever at hiding so you might need to do a good search. If they are ranging you might keep them locked in the coop or coop/run for a couple of days to see if you start seeing eggs.
I assume you can tell it is those six not laying by egg color? Or is it some other way? Most critters that eat eggs will generally leave some evidence behind, egg shells or a wet mess. Snakes and canines like fox, coyote, or dogs will eat them whole but will not discriminate by shell color. The only critter that I can think of that might discriminate by color is a human. It's unlikely they would be consistent for four weeks.
It's possible one can stop laying for no known reason. If they have not been laying for four weeks you can check to see if they are really laying by looking at the vent. If the vent is small and dry they are not laying. If it is large and moist they are. The difference is pretty obvious once you see it. And you have others that are laying to compare.
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