How does the author use foreshadowing in The Spirit Catches You and You Fall Down?

Fadiman continues to foreshadow the tragedy that befalls Lia as she describes the evening of her big seizure. When she tells us about Lia's trip to the hospital via ambulance, she notes: "If her parents had run the three blocks to MCMC with Lia in their arms, they would have saved nearly twenty minutes that, in retrospect, may have been critical" (141).