The Prophet (peace and blessings be upon him) said:
"A previously married woman expresses her consent herself, and the consent of a virgin is her silence."
Hadith Referenceصحیح الجامع الصغیر / حرف الثاء / 3084
Hadith Gradingالألبانی:صحيح
Hadith Takhrij[حم هـ] عن عميرة الكندي. الإرواء ١٨٣٦.