He could have but he didn't. It was appropriate for Mary to be a sinful human in that the whole point in Jesus coming was to interact and teach salvation. Not to glorify his birth mother. God's focus was on Jesus and his mission. Mary was a good and worthy choice of God to bear his son.
In order for Jesus to be born and fulfill His mission, He, God Incarnate, first had to be conceived and dwell in a womb. Now, consider, only the High Priest was allowed into the Holy of Holies to offer sacrifice to God for the sins of humanity. Would Mary not have to be so Holy and Perfect, to the point of being Second only to God, as to conceive God Incarnate, the Son of God, the most Holy and Perfect One, and offer Him to God the Father as sacrifice for the sins of humanity? Therefore, how could God not have preserved Mary's soul from inheriting the stain of original sin?
Peter says, “...like the Holy One who called you, be holy yourselves also in all your behavior; because it is written: “You shall be holy, for I am holy” (1 Pet. 1:15-16). Jesus, God Incarnate, was holy in all His behavior because He was without sin (1 Pet. 2:22), and thus He was completely Holy. Sin is disobedience, evil, and unholy (1 Jn. 3:4;8) and "no evil can dwell with God" (Ps. 5:4). If Mary was not without sin in all Her behavior, then She was not completely Holy and Perfect. Why would God, the most Holy and Perfect One, allegedly create a soul, and as God Incarnate take form and dwell in a body, that was not the most Holy and Perfect so as to be Second only to Him?
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