Just my thoughts…
In English, blessed (pronounced blest) can mean being granted divine favor or (pronounced bless-ed) it can mean being worthy of reverence or adoration.
That is why we can be blessed (blest) and God can be blessed (bless-ed). Mary is both!
It would be interesting to know the greek and hebrew behind each, to see if they are different words.
It reminds me of the Divine Praises…
***Blessed be God.
Blessed be His Holy Name.
Blessed be Jesus Christ, true God and true man.
Blessed be the name of Jesus.
Blessed be His Most Sacred Heart.
Blessed be His Most Precious Blood.
Blessed be Jesus in the Most Holy Sacrament of the Altar.
Blessed be the Holy Spirit, the Paraclete.
Blessed be the great Mother of God, Mary most holy.
Blessed be her holy and Immaculate Conception.
Blessed be her glorious Assumption.
Blessed be the name of Mary, Virgin and Mother.
Blessed be Saint Joseph, her most chaste spouse.
Blessed be God in His angels and in His Saints. ***
-Tim-