Should she spend on her parents who are poor without her husband’s approval?

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Check below answers in case you are looking for other related questions:
Wife disposing of her own money without her husband’s knowledge
Can a woman donate any of her money without her husband’s permission?

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Related Answers:
Is a husband obliged to spend on his wife’s Hajj?
If the husband disappears without a trace, who is obliged to spend on his wife?
His health is failing and his financial situation is bad, and he wants advice
Wife disposing of her own money without her husband’s knowledge
Can a woman donate any of her money without her husband’s permission?

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