How does the author use foreshadowing in Lie Down in Darkness?

In Chapter Five, Peyton's declaration to Dick Cartwright that she can't love aligns her more closely with her mother than the young woman could imagine. Her assertion that she is unable to connect with another person on such a deep level also puts into perspective the way she treats her father. Her admission simply serves to justify her mother's hatred of her. However, the fact that Peyton herself labels her supposed inability to love as "sick" provides effective foreshadowing for what occurs in Chapter 7. Her pronouncement becomes a self-fulfilling prophecy. The simple utterance sets in motion something subconscious which eventually comes into the light of Peyton's psychological landscape, rendering her unable to either stop or help herself.