How is the "monster" an important motif in the novel, The Love Letters of Abelard and Lily?

The monster is a recurring motif throughout the novel and plays an important part in Lily's experience living with a neurological difference. Lily develops a love-hate relationship with the monster inside of her, which is what she calls the part of her brain that causes her to be reckless and impulsive. She likens the monster in her brain to Frankenstein, and refers to Dr. Brainguy as her own personal Dr. Frankenstein. While a monster such as Frankenstein longs to have someone to love, Lily knows that "all it takes is one petty bureaucrat or stupid form to send the monster rampaging" (338).