"Why her, she's just an ordinary girl?"
"In the sixth month the angel Gabriel was sent from God to a city of Galilee named Nazareth, to a virgin betrothed to a man whose name was Joseph, of the house of David. And the virgin's name was Mary. And he came to her and said, 'Greetings, O favored one, the Lord is with you!' But she was greatly troubled at the saying, and tried to discern what sort of greeting this might be. And the angel said to her, 'Do not be afraid, Mary, for you have found favor with God. And behold, you will conceive in your womb and bear a son, and you shall call his name Jesus. He will be great and will be called the Son of the Most High. And the Lord God will give to him the throne of his father David, and he will reign over the house of Jacob forever, and of his kingdom there will be no end.'
And Mary said to the angel, 'How will this be, since I am a virgin?'
And the angel answered her, 'The Holy Spirit will come upon you, and the power of the Most High will overshadow you; therefore the child to be born will be called holy—the Son of God. And behold, your relative Elizabeth in her old age has also conceived a son, and this is the sixth month with her who was called barren. For nothing will be impossible with God.' And Mary said, 'Behold, I am the servant of the Lord; let it be to me according to your word.' And the angel departed from her."
Nazareth at that time was a city of no prominence. Though it is mentioned in the Gospels, there are no contemporaneous mentions of Nazareth. It does not appear in other writings until 200 AD. It was a town of around likely 400-500 people. A town in the hills of Galilee. A poor farming town. It was the country. To the point where it was even asked "Can anything good come out of Nazareth?"
We don't see Mary fight back against any of this. She simply says, "let it be done."
Do we really grasp that? God's plan for Mary's life was going to subject her to lies and slander about her character. She was going to be known for her lifetime in her hometown as unfaithful. There would be questions and rumors about exactly who she slept with. Joseph would likely be looked upon as either the one who couldn't wait or as weak for not exacting his remedy for her unfaithfulness.