All men grow and develop from seeds, as do apple and oak trees, and every other creature. And the creature that is to be, is wholly in the seed, simply to be nurtured and to grow and unfold to its maturity.
And so it was that Mary was immaculate in her seed, as the God of all Creation said to the Serpent-Tempter in the Garden, "I will put enmity between you and the Woman, between your seed and Her seed: and she shall crush your head, and you shall lie in wait for Her heal." (Apocalypse 12:1-18)
And Mary, mother of Christ-the-Messiah was the woman whose seed was immaculate, being created immaculate at its inception in total enmity with the Serpent who would have no part with her. And so, Mary, in her seed, grew and developed and unfolded to her maturity to become Mother to the Christ-Messiah, Saviour of the World, Son-of-God, God Himself, Second Person of the Tri-une Godhead, God manifest in the world in the Person of His eternally generated Son, God incarnate, in Whom dwelt the fullness of God, bodily. And this is why God created Mary immaculate in her seed, because she was to be the new Eve and Mother of all the Living, 'mother' to all who would have eternal life through her Divine Son Who was to be "the First-Born of many brethren." Each and all could only receive their life through, and from, Him. So, in this sense, she shares in the birth of all who are re-born in Him and destined for eternal life as the children of God, all who shall call God their "Abba - Father".
And so too, Mary the Immaculate One, being the purest of all creatures, never experiencing in herself the defects of a 'fallen human nature' was never to die, but in the Father's due time assumed sinless, body and soul, into heaven, taking place with her Divine Son, sharing forever in His role as Saviour and 'Father' of all the living.
"A virgin shall conceive, and bear a son, and His Name shall be called Emmanuel,
which means God-with-us." (Isaiah 7:14; Matthew 1:23)
"For a child is born to us, and a Son is given to us, and the government is on His shoulder:
And His Name shall be called, Wonderful, Counsellor, God the Mighty,
Father of the world to come, the Prince of Peace."