Makes sense. My opinion is that the uncommon ground are matters of scriptural interpretation. Every very important doctrine traces back to Scripture.
There are some prayer methods and helpers and devotions that trace back to post-Biblical events, like the Rosary and Fatima, but they are enhancers, not deal-breakers.
Maybe you’re thinking, for example, of how we honor (NOT worship) Mary, but that is Biblical in origin. The Assumption is hard for me to trace back, but experts can.
The key VERY important differences are the Eucharist and Reconciliation/Confession, but we do trace those back to the Bible.
I would personally say the Lord’s Supper, Confession/Absolution, and also Baptism too.
Traditions that are not commanded by God can be useful, but sometimes they can also get in the way of faith.
But surely not from anything she has been recorded as saying:
All the Words of Mary...
...as recorded in the Bible.
...To the angel
“How will this be,” Mary asked the angel, “since I am a virgin?”
Mary answered. “May it be to me as you have said.” (Luke 1:30-38)
...To Elizabeth
And Mary said: “My soul glorifies the Lord and my spirit rejoices in God my Savior, for he has been mindful of the humble state of his servant. From now on all generations will call me blessed, for the Mighty One has done great things for me—holy is his name. His mercy extends to those who fear him, from generation to generation. He has performed mighty deeds with his arm; he has scattered those who are proud in their inmost thoughts. He has brought down rulers from their thrones but has lifted up the humble. He has filled the hungry with good things but has sent the rich away empty. He has helped his servant Israel, remembering to be merciful to Abraham and his descendants forever, even as he said to our fathers.” (Luke 1:46-55)
...To Jesus
His mother said to him, “Son, why have you treated us like this? Your father and I have been anxiously searching for you.” (Luke 2:48-50)
... at Cana
And when the wine gave out, the mother of Jesus said to Him, “They have no wine.”
His mother said to the servants, “Whatever He says to you, do it” (John 2:3-5).