"None of that points to personal sin, -- that is sin committed by the will of the sinner, -- or to subsequent sexual activity."
That all comes from her own admission that she needed a savior and the testimony of the Apostles and Luke that she had other sons, James and Jude.
where does scripture say Mary had other sons? careful now
James and Jude are sons of Mary Cleopas, as the scripture makes clear.
Yes, Blessed Virgin Mary required our Savior like the rest of us. This is the Catholic teaching.