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If this is her first time sitting/hatching eggs it may just be that she is inexperienced and doesn't like the egg moving around under her....or she is prematurely "cleaning" the nest....I am not sure. If she makes it all the way to a baby hatching she may settle down and just enjoy herself. (Or, worst case scenario, she might kill the baby chick or duckling.)
I have two broody hens (Serama's) inside in crates right now. The first one had a chick hatch out on Saturday and then she abandoned the other two eggs she was sitting on. Just didn't want to sit on them anymore, and only wanted to take care of her little one that was out.
Fortunately, I was able to grab the other eggs (they were cold, too) and put them under the other broody hen. She hatched one out yesterday and FIVE more babies hatched overnight! Including the ones the other hen abandoned.
I wouldn't give up hope because the eggs are on day 24, because they can take longer to develop depending on the temperature being slightly down.
Rhodie, the mama who hatched the first baby is a good sitter, but an overprotective mama and this is the second time she abandoned eggs after one baby hatched. Lassie, on the other hand, is great little sitter and will sit until I take the dud eggs away.
At any rate, you will learn what type of broody she will make over time and can plan accordingly. If I did not have my back up hen, I would have fired up the incubator and had it ready to put eggs into when Rhodie abandoned the other eggs.
I have taken a mega dose of antihistimines this morning (durn allergies are driving me nuts!) so this may be as clear as mud......I hope it helps somehow.
If you candle the eggs and can see live babies in them and she refuses to sit on them and you don't have an incubator, put the eggs into a bowl with a towel in the bottom and aim a heat lamp towards the bowl-not directly on the eggs unless it is high enough not to cook them-if you have a thermometer you can keep track of the temps and regulate the heat by moving the bowl accordingly (the heat should stay at 99.5 for an average-at the top of the eggs it can be a bit higher 100-101), for humidity you can put in a sponge, paper towel or wet wash cloth-I wouldn't lay it on the egg, and you can loosely lay something over part of the bowl to help hold the moisture in.
Let me know if I can clarify anything. Good Luck!