Hen Breaking Open Eggs

[Maxines]

My hen has hatched 4 chicks, today she cracked open one of the eggs, she is still sitting on 5 and there was a chick inside that would of hatched in another 2 days. Is this normal, should we remove the rest of the eggs?

 

[Flutterbee]

I would be a little wary of letting her continue to sit if she killed one of the babies. Has she bothered any of the chicks or shown aggression towards them? If not, I would leave her be but keep a close eye on her.