Ilse Burnley is the daughter of Dr. Allan Burnley and Beatrice Mitchell. Her mother died shortly after her birth by falling into a well, though her father long believed she had instead abandoned the family with her cousin. This misunderstanding caused Dr. Burnley profound bitterness, leading him to neglect Ilse emotionally and physically for many years. As a result, Ilse was often cared for by housekeepers or neighbors and grew up appearing somewhat ragged and untended, marked by a lack of parental guidance and stability.

Physically, Ilse possesses blonde hair resembling daffodils, amber eyes compared to yellow diamonds, and fair skin. As she matures, these features develop into an unusual and striking beauty. Her personality is characterized by impulsiveness, a dramatic nature, and unconventional behavior. She exhibits an explosive temper, frequently engaging in fierce arguments with her closest friend, Emily Byrd Starr, during which Ilse hurls biting insults or harsh criticisms while Emily responds with silence. Despite these volatile conflicts, their reconciliations are swift, underscoring a deep, resilient bond.

A pivotal development occurs when the truth about her mother's death is revealed. During a feverish illness, Emily experiences a vision indicating Beatrice Burnley died accidentally in the well. This revelation prompts an investigation that confirms the truth, profoundly altering Dr. Burnley. He abandons his bitterness, embraces religious faith, and begins to actively cherish and spoil Ilse, transforming their strained relationship into one of affection and support.

Ilse demonstrates exceptional talent in elocution from a young age and actively pursues this passion. She relocates to Montreal to study at the School of Literature and Expression, continuing to develop her skills. Her career advances significantly, eventually earning her recognition as a renowned elocutionist. In her personal life, she marries Perry Miller, a childhood friend from their shared social circle in Blair Water.

Throughout her development, Ilse faces emotional challenges tied to her family dynamics. Episodes involving her father's remarriage plans trigger intense distress, causing increasingly erratic behavior as she grapples with these complex familial shifts. Her friendships, particularly with Emily, remain central to her life, marked by fierce loyalty despite their tumultuous disagreements.

Ilse's journey encompasses neglect, the resolution of family trauma, professional achievement, and enduring personal relationships, illustrating her transformation from a marginalized child into a confident adult.