I have read posts that say you need to take a broody hen and get her UNbroody. Do a search. The thing I have read the most is to put her in a wire cage.
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I have had a silkie hen successfully hatch a healthy chick at 30 days incubation - her hatch started at 26 days and she hatched a single chick every day through the day 30. 21 days is usual for most chickens, but sometimes silkies can take longer. If there is competition for food or harassment by an aggressive rooster and the hen has to spend extra time off the nest, the eggs may cool, and the embryo can go dormant for a while, and when the hen sits again the embryo resumes growth. If the egg is too cold or too hot for too long, the embryo will perish. Silkies are very persistent sitters and they will go broody and sit indefinitely even on no eggs at all. Some hens are good at rolling dud eggs out of the nest and others will continue sitting determinedly on a hopeless cause. Removal of the egg after 30 days for those hens that do continue to sit on a hopeless cause is recommended since the eggs can fill with gas and explode in the nest which is quite a smelly mess. When candling results are inconclusive it is better to leave the egg under the hen than crack it open prematurely - an egg that is about to hatch can be fairly dark with a dark chick or light with a light chick and for a novice it can be hard to tell if there's a live chick in there or not. For hens that sit forever without any egg, it can help to find them "foster" eggs to hatch, so they won't have to be broody as long and somebody gets some birds from the deal.