I honestly wouldn't give much hope to a day 25 chick, but if you want to try you can assist if it's been at least 12 hours (I wouldn't that early, but people do.) There's a great thread on assisting: https://www.backyardchickens.com/a/step-by-step-guide-to-assisted-hatching3 egg is at 25 day mark what do I due she has split shell open a little but will not come out please help me