Some hens with this will die of sudden death syndrome. I'm so sorry you lost her.
Putting a shell on and egg draws heavily on calcium reserves, and if they are low, calcium in the blood is drawn from. This can result in a heart attack.
This is why I keep a bottle of this in my run at all...
This may be your first experience with a hen having two eggs coming own the oviduct at the same time. Usually, one is shell-less and much more difficult to pass.
Give her a calcium citrate tablet or a Tums. She needs at minimum 500mg of concentrated calcium to stimulate contractions. Move her...