That would indicate a weak "God" if Jesus could have imperfection in Him just because Mary was a sinner like the rest of us.
Jesus was in her womb and nothing could have imparted sin unto Him.
He had His own blood, even though some Catholics say the He had Mary's blood in Him.
Jesus totally immersed Himself in a sinful world and He never was infected with the "imperfection" of those sinners he related to.
It's quite obviouis that God wanted Jesus to be born of one like other humans, instead of a sinless God-like human.
"All have sinned and come short of the Glory of God." Some say, Oh then Jesus sinned also. LOL, nope, He is the ONE that breathed that Biblical quote.
There was only one sinless person that walked the earth (after original sin came in via Eve, and then Adam), and that was Jesus.
Mary was a perfect mother for Jesus, but not perfect in the sense of sinlessness.
I have heard many Protestants claim that all of their sins past, present and future were washed away by the Blood of Jesus. It is an indication of a belief in a limited God to believe that He could not do so to preserve Mary from sin from the moment of Her conception.
Peace be with you