Mary was a sinner saved by grace just as any sinner. Silly to think she was sinless as those who believe in the immaculate conception do.
Luther's words follow:
It is a sweet and pious belief that the infusion of Mary's soul was effected without original sin; so that in the very infusion of her soul she was also purified from original sin and adorned with God's gifts, receiving a pure soul infused by God; thus from the first moment she began to live she was free from all sin.
(Sermon: "On the Day of the Conception of the Mother of God," December [?] 1527; from Hartmann Grisar, S.J., Luther, authorised translation from the German by E.M. Lamond; edited by Luigi Cappadelta, London: Kegan Paul, Trench, Trubner, first edition, 1915, Vol. IV [of 6], p. 238; taken from the German Werke, Erlangen, 1826-1868, edited by J.G. Plochmann and J.A. Irmischer, 2nd ed. edited by L. Enders, Frankfurt, 1862 ff., 67 volumes; citation from 152, p. 58)
She is full of grace, proclaimed to be entirely without sin- something exceedingly great. For God's grace fills her with everything good and makes her devoid of all evil.
(Personal {"Little"} Prayer Book, 1522)
There is no such a thing as ORIGINAL SIN! It does not make any sense.