Kimo, a girl's silence can also be accepted as consent and as a matter of fact this is how marriages are performed in places like Pakistan.
The Prophet (sallallahu aleihi wa sallam) said: "A guardian has no concern with a woman previously married and has no husband, and an orphan girl (i.e. virgin) must be consulted, her silence being her acceptance." [Sunan of Abu Dawud 2095, Narrated Abdullah ibn Abbas]
It is very telling how they always say 'marry a girl off' as if they are taking out the trash.
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