Where in the bible does it say she was born without sin? You won’t find it. The Catholic Church made it up
Where in the Bible does it say that the Catholic Church made it up?
Where in the bible does it say that the bible is the Christian Owner’s Manual, and that if it isn’t there, it isn’t real?
Mary, like Christ Himself, was born without the stain of Original Sin. That is so she could be a pure and untainted vessel to carry the baby Jesus to term. And then, after that, she simply NEVER sinned. She was also, as even Martin Luther agreed, a lifelong Virgin.
Mary’s case is simply a matter of Pure Reason. Just as we can also say, through pure reason, that both Adam and Eve were created (not born) without Original Sin, since sin did not exist on Earth until THEY authored it.