"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.'" (Using translation from Nasāʾī 3270)   

قَالَ رَسُولُ اللَّهِ ﷺ «تُسْتَأْمَرُ الْيَتِيمَةُ فِي نَفْسِهَا فَإِنْ سَكَتَتْ فَقَدْ أَذِنَتْ وَإِنْ أَبَتْ لَمْ تُكْرَهْ»