" تُسْتَأْمَرُ الْيَتِيمَةُ فِي نَفْسِهَا فَإِنْ سَكَتَتْ فَهُوَ إِذْنُهَا وَإِنْ أَبَتْ فَلاَ جَوَازَ عَلَيْهَا "
It was narrated that Abu Hurairah said: "The Messenger of Allah said: 'An orphan girl should be consulted with regard to marriage, and if she remains silent, that is her permission. If she refuses then she is not to be forced.'"