She is fine, and will take care of the chicks herself.
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I agree, it would hep her though if you can get some hay in there for nesting material so her eggs are more protected from cold radiating up through the floor. You should do your best to mark the eggs somehow so you can pull any added from this point forward. Staggered hatches are problematic, to say the least, most of the year but in winter cold they are a recipe for tragic losses.She is fine, and will take care of the chicks herself.