Mary is often painted as calm and still, as if Gabriel’s words cost her nothing. Luke tells a different story. She is troubled. She wonders what the greeting means. She asks a sensible question about how any of this could happen. Only after that does she say yes.
Her yes is not blind. It is the answer of someone who has heard enough to trust the one speaking, even though she cannot see where it leads. She does not know about Bethlehem, or Egypt, or the cross. She knows that God has spoken and that nothing is impossible for him.
Most of the big decisions in a family are made like this, without knowing how they will turn out. Mary shows that asking questions and trusting God are not opposites. She brought her question to God, and then she gave him her life. That is still a good order to do things in.