Well, when & after the ex-bats were living with her, she ate damaged & weak shelled ones, then went broody!
there are no ex-bats now & I have moved where they live, so she isn't too bad - the eggs are stronger & we get them mostly before any damage is done (they are abit bonkers in that pen, and lark about or lay in daft places!)
I just won't take a chance with hatching eggs, so there is no cockerel in there.
I use the incubator for the RIRs as they havent (yet) gone broody...