Poor mom. Hopefully she won't get into anymore scuffles. I know this may sound like a dumb question, but how does one know when a chick hatches early?

What type of chicken is the mother? Do you keep all your babies? What do you do when they get older? Are they shown? I'd like to show chickens one day, but that won't be for a long long time as I know nothing about them. I'd like to have my children involved in 4H. I think it would be fun.