Is there any sign of shell remains or is there just that collapsed membrane? My guess would be a novice layer produced a shell-less egg and it ruptured when she stepped on it. Then she and her pals finished off the contents of the egg.
If the egg ruptured inside the chicken, though, you may see one of them acting lethargic if there is any egg still inside of her. This can become infected and result in a chronic reproductive infection. It bears close watch in case you need to step in and treat with an antibiotic.
As a rule, even though some new layers have glitches in the beginning, they usually resolve on their own and they go on to lay normal eggs.