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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Related Answers:
Are the marriages of the disbelievers regarded as valid for them and are the children to be attributed to them?
It is not permissible for a woman to marry her slave, according to the consensus of Muslim scholars
Her guardians refused to arrange her marriage, so the local imam did the marriage contract without documentation
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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