The Book of Marriage (Kitab Al-Nikah)
Muslim :: Book 8 : Hadith 3305
'A'isha (Allah be pleased with her) reported: I asked Allah's Messenger (may peace be upon him) about a virgin whose marriage is solemnised by her guardian, whether it was necessary or not to consult her. Allah's Messerger (may peace be upon him) said: Yes, she must be consulted. 'A'isha reported: I told him that she feels shy, whereupon Allah's Messenger (may peace be upon him) said: Her silence implies her consent.