Mama Hen picking new chick, is this normal?

[Allsfairinloveandbugs]

I'm so sorry. Chick was three weeks old yesterday; do you know what happened? (If you don't want to talk about it I/we understand.)

 

[Allsfairinloveandbugs]

I went and read your original thread and saw you posted more info there, so no need to answer my question here.