Is the marriage valid if the woman says to her fiancée “I give myself to you in marriage” in the presence of her wali?

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Check below answers in case you are looking for other related questions:
The ruling on doing the marriage contract in the presence of the wali (guardian) but with the proposal and acceptance done between the husband and wife
He married a woman without a guardian

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The ruling on doing the marriage contract in the presence of the wali (guardian) but with the proposal and acceptance done between the husband and wife
He married a woman without a guardian

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