God needed a strong, smart and loving earthly home for his Son. He chose Mary, a young virgin from Galilee (who happened to be Elizabeth's cousin). When the angel Gabriel came to her and told her about how she was chosen for this difficult and most important job, of course she was startled and confused. "How can this happen as I am a virgin?" she asked.
Gabriel told her about how God had blessed Elizabeth which definitely was a miracle based on her age, and proved that God could do anything. So being a faithful servant of God, she said "let this happen as you say".
This is a cool ornament we had as part of my collection....thought it would work well for The Virgin Mary
....The angel replied, “The Holy Spirit will come upon you, and the power of the Most High will overshadow you. So the baby to be born will be holy, and he will be called the Son of God.
~ Luke 1:35