Henrietta, Chloe and Arthur died every day; more specifically, every night the current version of Henrietta was killed by hundreds of other versions of Henrietta. The next version would come to the hen house and knock, and the current version would go outside to meet her fate.
One day, Chloe and Arthur were surprised to find three eggs. Soon the Sixth Doctor came to the bed and breakfast, and he too became involved in the daily deaths. Every day thereafter, Henrietta provided three eggs for breakfast. After several days, the Doctor finally decided not to go the window when his next self knocked. The cycle of deaths was ended. (PROSE: The Death of Me)