My SS became broody a few months ago, so I got 4 fertilized egg from my sister-in-law. Three of those eggs developed. One hatched but my SS started to peck at it and injured it. I removed the chick and I think she will be ok. My SS is really tame, she has been great with the eggs, carefully sitting on them every day. She was great, until the one hatched. This is her first clutch. Why did she try to get rid of the chick??