All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
Muslim jurists held different opinions regarding the ruling on the consent of the Wali (bride’s guardian) in the marriage contract, and the majority of scholars stipulated his consent as a condition for the validity of the marriage contract, and this is the opinion adopted at Islamweb given the strength of its supportive evidence. Abu Haneefah on the other hand, disagreed on this issue and held that it is permissible for a woman to marry herself off and that a marriage contract conducted in such a manner is valid. If the contract in question was conducted in imitation of the Hanafi school of Fiqh, then the marriage contract is valid. So this girl should disregard these whisperings, especially since she has already consulted a scholar and he advised that the marriage contract is valid. With regard to renewing the marriage contract in the presence of her brother, it would be a statement of the obvious (i.e. unnecessary), noting that the Hanafi scholars held that the validity of appointing a farther Wali is conditional on the approval of the nearer Wali.
If this judge did not issue his judgment on the validity of the marriage in his capacity as a judge, then his opinion is regarded the same as the opinion of any other, and accordingly, it is not considered a judicial verdict on the validity of the marriage contract. Nevertheless, this marriage contract is valid, as we have mentioned above, and therefore there is no need for undue confusion and worry.
We conclude the answer to this first part of the question by pointing out that although an adult young man is not Islamically required to inform his parents of his marriage, he should not marry without their knowledge. He needs to consult them and avail himself of their sound opinions given their old age and greater life experience, in addition to his need to share his joy with his family. The same applies to the girl, as she needs her parents. Rather, it is impermissible for her to get married without the knowledge and consent of her Wali, because his consent is a condition for the validity of the marriage contract, as we mentioned above.
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Allah Knows best.