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I didn't mark my eggs, and the broody wound up with eight instead of four! So, I candled, and all had developing chicks! I had to abort the the new ones, because she would have abandoned those eggs less developed for her hatched chicks. So mark those eggs!
And, she will accept it as long as you add it under cover of darknes, so to speak. My hen abandoned one late-hatching chick I wound up having to hatch out (he was too big and trying to come out belly-first) so I dried him off and put him with her at night. She doesn't care whatsoever! Hens can't count, and the chick should trigger some maternal instinct. Unless it acts abnormally weak, she should accept it. If it appears weak to her, she may abandon it for the strong one.