[Diva]

Mary the Mother of Jesus a.k.a. God, is the Arc of the Word made Flesh, of course she never sinned.

[irishtenor]

It must be a surprise to God, who said in his word that all have sinned and fall short of the glory of God.

[DallasMike]

of course she never sinned.

Looks like the Bible disagrees with you:

[A]as it is written: "There is no one just, not one, there is no one who understands, there is no one who seeks God. All have gone astray; all alike are worthless; there is not one who does good, (there is not) even one. (Romans 3:10-12)

If Mary were truly sinless, this would have been one of the several good places for scriptures to state this. A sinless Mary was most definitely not the teaching of the early church and many of the early fathers stated as such.

I'll take the plain teaching of scripture and the express teaching of the early church anyday over some myth concocted centuries after the church was founded.