Final answer:
Mathilde is vain and frustrated at the beginning of 'The Necklace.'
Step-by-step explanation:
Mathilde's character at the beginning of 'The Necklace' can be described as vain and frustrated. She is dissatisfied with her current social status and constantly yearns for a better life. This is evident when she borrows an expensive necklace to wear to a party, only to lose it, leading her to a desperate search and eventual downfall.
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