It is permissible
to contract the marriage of a young girl by her father especially if he sees some contingent benefit for her in it. This is supported by the story that the Prophet (peace be upon him) married
`Aishah when she was less than nine years old. However, no one other than a father may contract the marriage of a girl who is less than nine years old. Moreover, girls over the age of nine may not be married unless their permission is sought. The Prophet (peace be upon him) said:
A matron should not be given in marriage except after consulting her; and a virgin should not be given in marriage except after she gives consent. The people asked, “O Allah’s Messenger! How can we know her consent?” He said, “Her silence (indicates her consent).”
If a dispute arises thereafter, it should be referred to Shar`y (Islamic legal) courts. (Part No. 18; Page No. 124) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.