Original sin is spiritual death; separation from the living God. Jesus could not possibly have been in such a state, for His human nature could not be simultaneously hypostatically united to God the Son and separated from God by sin. So even if Mary had been a sinner, Christ would not have contracted original sin from her. However a sinful mother would have been a dishonor to Him so she was granted this special grace.
I am curious why you deny this grace to the very Mother of God, Spouse of the Holy Spirit?
Will you provide Scripture which indicates "...she was granted this special grace."
Thank you,