Jealous orphan who initially sabotages Lizzie but learns honesty and teamwork through the garden.
Martha's authority forces Geraldine to acknowledge the truth.
Martha punishes Geraldine for lying, prompting Geraldine to confess her role in the missing-key incident.
Geraldine's jealousy creates a direct obstacle for Lizzie.
Geraldine is jealous of Lizzie, helps cause the key to be stolen, and initially denies responsibility when confronted.
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