I agree with not breeding this bird and potentially passing along her defect.
A broody hen sits relentlessly on the nest, only getting off a couple times a day to eat, drink and poop. And when they do get off the nest they are cranky, nasty things! They will often puff up like a bowling ball and walk around growling while they take care of necessities, then it's straight back to the nest. If you mess with one on the nest you may get growled at or pecked.
The other issue you would have in letting her brood, if she went broody, is that then you will have to figure out what to do with the roosters you hatch. In your particular situation, if you wanted a few more hens, I think I'd go with buying some sexed chicks. That's not 100% fool proof either but your chances of getting roo's are much less.
A broody hen sits relentlessly on the nest, only getting off a couple times a day to eat, drink and poop. And when they do get off the nest they are cranky, nasty things! They will often puff up like a bowling ball and walk around growling while they take care of necessities, then it's straight back to the nest. If you mess with one on the nest you may get growled at or pecked.
The other issue you would have in letting her brood, if she went broody, is that then you will have to figure out what to do with the roosters you hatch. In your particular situation, if you wanted a few more hens, I think I'd go with buying some sexed chicks. That's not 100% fool proof either but your chances of getting roo's are much less.