How does the author use foreshadowing in Mrs. Mike the Story of Katherine Mary Flannigan?

The momentary glimpse of the future that Katherine beholds as she views the sparkling cemetery foreshadows actions taking place later in the novel. Katherine has what is called a premonition, as is evidenced by the following quote, "There was the tiny distant figure of a woman walking through the graveyard gate, and for a second thought it was me" (pg. 150.)