No, but Catholic dogma apparently is.
God, at the very beginning of the world picked Mary as the Mother of Christ.
True.
Through Him [Mary] was spared from original sin
False. And nobody can cite any scripture which logically and reasonably supports the drawing of such an outlandish conclusion.
All have sinned, and fallen short of the Glory of God. All.
Christ was God. Mary was not. As Blessed as she was, she was still a sinner, just like you, me, and every Saint that ever lived.
There is absolutely no scriptural basis for claiming otherwise. Such claims represent the height of whimsical, man-made supposition. Wishing them to be true does not make them so.