A woman without a husband has more right to her person than her guardian, and a virgin's consent must be asked from her, and her silence implies her consent.
أَنَّ النَّبِيَّ ﷺ قَالَ الأَيِّمُ أَحَقُّ بِنَفْسِهَا مِنْ وَلِيِّهَا وَالْبِكْرُ تُسْتَأْذَنُ فِي نَفْسِهَا وَإِذْنُهَا صُمَاتُهَا قَالَ نَعَمْ