Earlier in the story, the woman has a dream that she finds her sister in Texas is the most obvious example of foreshadowing for this event.
Foreshadowing is a term of origin in Latin praesagium that refers to:
According to the above, the best example of a foreshadowing would be a dream because it is a way of warning an event in an "unconventional" way that involves intuition and other types of sensations.
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