Recently I had a hen I hatched from an incubator not too long ago go broody. She decided she wanted to be a mom. I thought now that's cool! So I gave her a half dozen eggs to sit on in the main coop! (1st mistake) did not Mark the eggs (2nd mistake) lot of laying hens in same coop. So I let her set diligently on the eggs and waited 21 days. Curiosity got me I had to have a peek so I looked and she wasn't on the 6 eggs I put under her but on clutch of 20 eggs. At that point I panicked a little. (3rd mistake) I moved her and the 20 eggs to a smaller coop. The next day one hatched and I was excited I thought I and she had pulled it off. 2 days later another hatched but I found it dead. I thought, oh that happens. Then next day another hatched same thing dead in same place as other one. Then I thought this is strange. What is happening here? Next day 2 more hatch alive and flipping around. So I kept a close eye on them. Then I saw it, she pecked and killed them before I could get to her. Frustrated I removed the rest of the eggs to an incubator to see if I could hatch them there safely. I left her one chick with her who was running around pretty good so it should be fine or was it? (4 mistake) I found it dead the next morning in the waterer. So did I make too many mistakes or is she a little crazy? Since I moved the eggs to the incubator 4 have hatched and alive and kicking in the brooder. So any advice on this occurrence is appreciated!