why do the sisters treat mirabella like an outcast? cite specific evidence from the text to support your answer.

The sisters treat Mirabella like an outcast because she resists assimilation into human norms and repeatedly breaks the rules that define acceptable behavior at their school. Mirabella fails to adapt to the lessons meant to civilize the girls; while the other girls walk upright, wear shoes, and control impulses, Mirabella continues to growl, bite, and sleep under the bed, refusing to perform the expected human behaviors. For example, the text describes her biting pencil tips, eating from the floor, and disrupting a school dance by attacking a boy to protect a packmate, which marks her as different and dangerous to the group's progress. The sisters' frustration turns into deliberate exclusion: they hide their food from her, trade her gifts for demerits, avoid sitting near her, and mimic the nuns' language by calling her incorrigible and feral. This ostracism is driven by fear that Mirabella's wolf-like behavior will jeopardize their acceptance into human society, as well as self-interest in demonstrating their own progress and avoiding being dragged back a stage. Ultimately, Mirabella's expulsion from the school shows that the institution and the sisters deem her beyond rehabilitation, and the sisters comply because accepting her threatens their own advancement. The girls feel a guilty relief when she is led away, and they do not look back, highlighting the social and strategic nature of her outcast status.