Nanny, an elderly caregiver tied to Marnie’s childhood, manages the girl’s daily routines in the Marsh House alongside two maids during her parents’ prolonged absences. The household staff subjects Marnie to psychological and physical abuse, threatening confinement in a nearby silo as punishment—actions deepening Marnie’s fear of abandonment and emotional isolation. Nanny’s strict enforcement of rules mirrors the neglect of Marnie’s parents, who prioritize social commitments over their parental duties. During a Marsh House party, Nanny’s insistence on adhering to bedtime provokes Marnie to lock her in a room, highlighting the fraught power dynamic between the child and her caregivers. Nanny’s harshness and the maids’ cruelty, chronicled in Marnie’s diaries and recounted by Hisako, a local painter acquainted with Marnie’s history, illuminate the origins of Marnie’s trauma. These accounts reveal how the abuse reverberates across generations, influencing Anna’s own battles with self-doubt and belonging. Nanny remains defined solely by her role as an authority figure whose severity intensifies Marnie’s loneliness, leaving lasting scars on the latter’s emotional landscape.