How does the author use foreshadowing in Matched?

There are many moments of foreshadowing in Matched. Following a visit with her grandfather, just before her relationship with Ky Markham begins, Cassia feels that, like her grandfather, her time is running out. Cassia remarks one day that her friend's maple tree won't last long, referring to its poor health, only to later watch as all of the maple trees in the neighborhood are cut down.