In other words, God chose to send His into this world through Mary. He could have done it any other way. He is God after all. In sending his Son to this world to save us in this way , God establishes an order of things sort of speak; an order of the flow of graces that was in effect then and continues to be in effect today.
At the Wedding at Cana, Mary instructs the waiters "Do whatever He tells you" (see John 2:5). In a sense she is revealing who Jesus really is and is sending others to him. In the Gospel of John, the Wedding at Cana is a "new creation" story for the gospel writer John. He wants us to see Mary as the “New Eve.” At Cana, the New Eve radically reverses the decision of the first Eve. The first woman led the first Adam to commit his first evil act in the garden. At Cana, the new woman leads the New Adam to perform His first glorious work. The first Eve counseled Adam to defy God and eat the fruit. The New Eve brings the people’s needs to her Son and teaches the people to obey Him in faith - "Do whatever He tells you" (see John 2:5). The first Eve was "the mother of all the living" (see Genesis 3:20). By teaching the disciples and servants to believe in Jesus, the new Eve becomes the mother of the Church - "the children of God" (see John 1:12; 19:26-27).
Even today, Mary continues to say over and over again "Do whatever He tells you.”