Isn't there a difference between intentional, deliberate, premeditated, willful sinning and sinning by mistake due to inherited human imperfection from Adam, or Adamic sin?
Hebrews 10:26.
So, yes, Mary was not a practicer of sinning on purpose. If Mary was sinless, or in other words, Mary was born humanly perfect, then Mary would still be on earth today because those with human perfection as Adam and Eve originally had never die, but have everlasting life as a perfect human living on a paradise earth in perfect health in mind and body.
A virgin birth would show that no human fathered Jesus. There would be no question as to who was the father. No one could point to Joseph as the actual father.
Let say that as recorded Eve sinned, however, what if Adam had never sinned?
Eve became imperfect because of sinning. If Adam did Not go along with Eve then Adam would have remained humanly perfect. Would God have given Adam another wife, or would Eve have lived until her 'death' parted them? Gen 2:24.
Since we don't have experience with a perfect human mating with an imperfect sinning human we do know that the child from such a union would not be born with human perfection. Perfection over riding imperfection. 1st Cor 7:14 B.
Wouldn't Romans 3:23; 5:12 have to be wrong in order for Mary to be born perfect?
Also, if Mary was perfect giving perfect life to Jesus, they why couldn't Mary pass on her perfection to Jesus fleshly brothers and sisters? Matt 13:55; Mark 3:32; John 2:12, 7:5