We have to make a correction here, if what you propose is true, then Jesus is not of the lineage of David, and the prophecy of Gabriel will not be fulfilled,
And, behold, thou shalt conceive in thy womb, and bring forth a son, and shalt call his name JESUS. He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David: Luke 1:31, 32
The Holy Spirit fertilized the ovum in Mary's womb, but the wonderful and miraculous thing about conception is at the moment of, the egg starts producing it's own blood, it receives not one drop from the mother, only her half of the chromosomes and nourishment, ...since Salomon's line was cursed, the Messiah had to be from the line of Nathan, which is given to us in Luke's genealogy of Mary, hence Jesus, as the Son of Mary, who has the DNA of David from and through Mary, has the legal right of inheritance to sit on the throne of his grandfather David, something that has not yet taken place as of yet.
As for the veneration of Mary, she deserves as much as the mother of David, or Solomon, or Moses, or Elisha, she was a sinner just like the rest of us and she knew it, what are her last recorded words, ...Whatsoever He says to you, ...do it!