Polly Harrington fulfills the role of primary guardian to her orphaned niece, her jaded and cynical outlook forged by past hardships. As a scion of the affluent Harrington family in Beldingsville, she wields a reputation for stern authority and emotional reserve. The lingering rift with her late sister Jennie—Pollyanna’s mother—originates in Jennie’s defiance of family expectations by eloping with John Whittier, a man beneath their social standing. This betrayal cemented Polly’s bitterness, exacerbated by a youth spent in Jennie’s shadow, where their sisterly bond was tinged with rivalry and comparisons to Jennie’s perceived accomplishments.

A failed romance with Dr. Chilton, severed by misunderstandings and fallout from Jennie’s marriage, deepened Polly’s isolation, leaving a 15-year estrangement. Duty, not affection, drives her to take in Pollyanna, whose arrival reignites unresolved wounds. Polly’s rigid control over Beldingsville sparks friction with townspeople, exemplified by their rebellious charity bazaar—an act of collective defiance against her ironclad governance.

Pollyanna’s unwavering optimism gradually erodes Polly’s defenses, though her transformation crystallizes only after the girl’s devastating accident. Faced with Pollyanna’s suffering, Polly grapples with guilt over years of emotional distance, prompting her to seek Dr. Chilton’s medical aid. Their collaboration mends both the niece’s health and their fractured bond, culminating in marriage.

Once guarded and austere, Polly’s journey reveals a capacity for vulnerability: she accepts community support, embraces her niece’s influence, and trades control for connection. Adaptation-specific nuances depict a younger Polly, her childhood clashes with Jennie, and the enduring scars of familial discord. Her eventual alignment with Pollyanna’s philosophy underscores a narrative thread of healing through openness, framing her evolution as a testament to reconciliation’s quiet power.