Not only is she approached directly by God as one free to make her own decision, but she insists that the Angel explains himself. Then she gives her consent, which is freely given and not mediated by any male relative.
It could have exposed her to death by stoning, as she could not know how Joseph would react.
There are in fact no passive women in the Gospels.
In their dealings with Jesus they argue, challenge, make demands, recognise him as Messiah and are treated with respect by him.
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