I'm sorry about your little chicken. I don't know if I missed it in this thread but when my ducks have egg-bound problems I give them calcium gluconate. It's a liquid that you can buy at Tractor Supply which is much easier to give than a pill and in my experience it works fast. Also, you can buy calcium citrate in powder form that you can sprinkle on their food when you begin to see thin-shelled eggs from your flock. I keep that in a spice shaker and put on the food as needed.
