brahma-drama keeps getting worms

hey friends

we are trying to rise colombian-buff brahma, which turn out to be really difficult mission!
as chicklings they are VERY sensitive, but the wired thing is that they keeps getting worms, our female died today because of it.
there is no Diatomaceous earth here ,but i wonder whats worng with the soil that the keep on having it?

so now only one roo is by himself in that big coop /:

do you use any chemicals on your plants? if you do it could be poisoning the worms that are in that dirt which could be poisoning your chickens.

nop. no chemicals at all
i use only compost, compost tea and EM (effective micro-organisms)
we do have a small compost pile inside the coop, but i don't think that this is what causing the worms

Are your hens in the same area year round? It could be a previous generation of hens loaded the area with worms without displaying symptoms themselves. Chick pick them up and are more susceptible to them.

Rotation is commonly used with livestock precisely to break the reinfection loop. You may need to keep them off the land for 2 to 3 months to reduce the worm load in the soil sufficiently.

What type of bedding are they on? Bare earth? Concrete? Deep litter/woodchips?

the coop is relatively new (8 month) and first time on that batch, we don't do rotation cause our place is really small.
the chickens are there most of the times because we have foxes issues, so the cant run around with no "shepherd"
the coop itself is mulched with wood chips, not so heavily, under is it there is soil