I finally figured out what was wrong with my Delaware. About once a week she has egg binding symptoms, usually manages to lay a soft/shell-less egg. I'm just glad I never had to take drastic steps to get the egg out of her.
From reading lots of articles on-line, seems like calcium is probably the main cause. I feed my chickens Southern State Layer Feed, free access water and oyster shells. The chickens are out in the yard 12-14 hours a day. Is it possible that the Delaware doesn't go for the oyster shells while the others do? How do I feed more calcium? Thanks!!