How does the author use foreshadowing in In the Cemetery Where Al Jolson Is Buried?

While at the beach, the narrator muses on forms of danger, recalling a time in college when she and her friend thought they could forestall an earthquake by repeating "earthquake, earthquake, earthquake" because "it never happens when you're thinking about it." The verbal repetition, however did nothing to prevent an aftershock during a 1972 earthquake the friends witnessed as college roommates. This thought foreshadows the friend's impending death: she will continue with her joking references to death, attempting to ward it off, until she dies.