My 8 months old light Sussex chicken became broody and I bought 7 fertilised eggs. She has being sitting on them for 19 days and on the last 3 days we noticed that every day she cracks an egg. Today we have 4 eggs left and one dead chick besides her. Is it a normal behaviour for a first timer? Why would she be doing that and what should I do? I don't have many chickens, should I try again next time she is broody?