Venerable Brethren and Beloved Sons and Daughters: Blessed be the Lord God, Father of our Lord Jesus Christ, Father of mercies and God of all consolation, who comforts us in all our tribulation. Blessed also, she whom He appointed Mother of Mercy, our Queen and our beloved Advocate, Mediatrix of all graces, and dispenser of all His treasures.
... the glorious Virgin, triumphantly entering the heavenly homeland, through the nine choirs of angels, was raised even to the throne of the most Holy Trinity, who placed upon her brow the triple diadem of glory. There she was presented to the court of heaven, seated at the right hand of the Immortal King of Ages and crowned Queen of the Universe.
And the King saw that she was truly worthy of such honour, glory and empire, because she was more filled with grace, more holy, more beautiful, nearer to the divine, incomparably more so, than the greatest saints and sublimest angels, separately or together. This because she is mysteriously related in the order of the hypostatic union with the Blessed Trinity, with Him who is in essence the Infinite Majesty, King of Kings and Lord of Lords.
Because she is associated as Mother and Helper of the King of Martyrs in the ineffable work of human redemption, she is also, forever, most powerfully associated in the distribution of grace and divine redemption. Jesus is King of the eternal ages by nature and by conquest. By Him, with Him, and under Him, Mary is Queen by grace, by her divine relationship, by conquest and by singular election. And her kingdom is vast, vast as that of her divine Son, because from her dominion none is excluded.
Source: Pope Pius XII, May 13th, 1946, Vatican Radio Message to Fatima, broadcast after the coronation of the statue of Our Lady of Fatima by Papal Legate Cardinal Benedetto Aloisi Masella, marking the 300th Anniversary of the consecration of the nation of Portugal to Mary. See Acta Apostolicae Sedis, Vol. 38, 1946, pg. 266, Libreria Editrice Vaticana, ISBN: 882096046X