I really do love our Blessed Mother, but here again I feel I have little to say. Surely her Assumption was necessary for her Coronation. She does show forth the Lord's glory quite well - daughter of the Father, mother of the Son, spouse of the Spirit. And, as in the Wedding at Cana, she is pleased to request of her Son what the people need, and He is inclined to grant her desires, even if they were not His original plan (though her will must be so conformed to His own... mysteries are so difficult to make completely transparent!).
But the fact that she is Queen tells us something about our own heavenly glory. We will be glorified, strange as that may seem, and while that may have some connection to our earthly lives, the principal reason for our glorification is because Jesus wants to. What an honor!
Too, the Queen of Heaven and Earth takes over from the Mother of All the Living and leads her children in the right path, the path to heaven - just as her Son died on the cross so that "he who overcame by a tree might be overcome by a tree" (Preface of the Holy Cross).