How does Beagin’s use of the third person limited point-of-view help develop character, plot, and theme?

Early in the novel, Greta shows signs of her future manipulation of Big Swiss. How does Beagin foreshadow the specifics of their relationship and its end?

What role does Greta’s job as a transcriptionist play in both the novel’s structure and its narrative? How do structure and narrative interact in this instance?