““Normal” begs the question of her worthiness.”
We (Mary included) are not worthy. That’s the whole point.
The Father gave her the supernatural grace to be worthy of his Son. Meditate on the reason why Jesus was born of a virgin rather than as John was, as Isaac was,as Samuel was, by natural grace through the intercourse of a man and a woman. The Virgin Birth was not a “miracle,” but the Creator taking on the form and substance of a creature, becoming a man