He replied:
Praise be to Allah. By agreement of the imams, neither a paternal uncle nor any other guardian may marry a woman under his guardianship to an incompatible match without her consent. If he does so, he deserves a punishment under Islamic law that will deter him and others like him from such conduct. Indeed, even if she consents to an incompatible match, another guardian besides the one who contracted the marriage may have it annulled. A paternal uncle has no right to compel an adult woman to marry even a compatible match; how much more objectionable, then, is compelling her to marry an incompatible one! Rather, by the consensus of the Muslims, he may marry her only to someone she accepts.
If he tells her, “If you do not give permission, you will be married off under Islamic law without your consent,” and she gives permission because of this, neither that permission nor the marriage based upon it is valid. By agreement of the imams, Islamic law does not empower anyone other than the father and grandfather to compel a minor girl to marry. The scholars differed only concerning “the father and grandfather” in the case of an adult woman, and concerning minor girls generally.
If her husband has married her under a valid marriage contract, he must fulfil his obligations towards her and must not wrong her in her person or her property. He is liable for whatever he has taken of her property. If she complains, he has no right to prevent anyone from ascertaining her circumstances. He must either allow someone, such as her mother or another person, to visit her and ascertain her circumstances, or arrange for her to live next to truthful, religiously upright neighbours who can ascertain her circumstances. And Allah knows best.