How does the author use foreshadowing in Strange Interlude?

In Part I, Act I, Nina's comment about having no big/little Gordon functions on two levels. First, it foreshadows and defines her constant search for someone to replace Gordon and the way she constantly compares the men in her life to him. Second, it foreshadows the birth of her son a few acts hence, and the fact that she names him Gordon and becomes as obsessed with him as she is with the memory of his namesake.