How does the author use foreshadowing in Till We Have Faces?

When Orual visits Psyche, she tells her sister that she will do everything she can to come visit her again but that she doesn’t know wheatear she will be able or not because the King will not let her leave. Psyche then tells Orual that the King will not be a problem for her, foreshadowing thus the fact that the King will leave the palace for a few days, something that happened immediately after Orual reached the palace.