because she is the true bride of the Lord of glory. The word of the Lord in the psalm was realized in her: "Listen, O daughter consider and incline your ear; forget your own people also, and your father's house; so the King will greatly desire your beauty; because He is your Lord, worship Him" (Ps. 45:10-11). That is why she was called the friend of Solomon, who is the virgin of the Song of Songs.
It was said of her in the same psalm: "The royal daughter is all glorious within the palace; her clothing is woven with gold. She shall be brought to the king in robes of many colors" (Ps. 45:13-14).