Initially I have to say, the Bible doesn't always record ones specific sins. As an extreme example, one might ask, Q) Where does the Bible say Epaphroditus sinned?
But I get that most peoples answers here are just by fact of pointing out Mary is a human. And this is not a cop out.
The only sinless human-God [incarnated] was Jesus - Hebrews 4:15... let alone the only human-God (Luke 1:35 points out that "The Holy Spirit will come upon you, and the power of the Most High will overshadow you; and for that reason the holy Child shall be called the Son of God.", i.e., that is, he is the Son of God (in divine essence with the Father) because of God's part, not Mary's, that he is divine. Matt goes down the path of saying he is "of the Holy Spirit" and that Joseph had no biological contribution (1:16 even goes out of it's way to make Joseph not the "father of" Jesus, but the "husband of" Mary).
But then there are some specific things written concerning Mary to further go more particularly down this path:
Luke 2:35, 1:47ff - showing her being convicted by the need to respond to the gospel/Christ (similar to other hearts being convicted) and showing her express her God as her Saviour and seeing herself completely under his mercy.
And find one example in the NT where an Apostle pointed to her as one to whom we should pray, a dead human (therefore, since also only Jesus has resurrected again - 1Cor 15 and the rest of us wait for his return to receive our new bodies - only Jesus was not under the power of sin/death. As such, she was a sinner). If Jesus never rose again, we have no reason to hope in him - 1Cor 15. And if she didn't arise in her new body, which she didn't because only one man did until the time for the rest of us (bodily), she is no source of perfection.
The bible does not teach we should pray to dead humans. That kind of idea is necromancy .We pray to eternal God .He is not a man and neither is there any fleshly mediator as a infallible umpire that stands between God not seen and man seen . One is our Father as lord in heaven.
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