Yes, she is -- as defined in Scripture!
So are you saying that you do not believe Holy Scriptures:
13 [36-37] The sign given to Mary in confirmation of the angel's announcement to her is the pregnancy of her aged relative Elizabeth. If a woman past the childbearing age could become pregnant, why, the angel implies, should there be doubt about Mary's pregnancy, for nothing will be impossible for God.
14 [43] Even before his birth, Jesus is identified in Luke as the Lord.
15 [45] Blessed are you who believed: Luke portrays Mary as a believer whose faith stands in contrast to the disbelief of Zechariah (Luke 1:20). Mary's role as believer in the infancy narrative should be seen in connection with the explicit mention of her presence among "those who believed" after the resurrection at the beginning of the Acts of the Apostles (Acts 1:14).
16 [46-55] Although Mary is praised for being the mother of the Lord and because of her belief, she reacts as the servant in a psalm of praise, the Magnificat. Because there is no specific connection of the canticle to the context of Mary's pregnancy and her visit to Elizabeth, the Magnificat (with the possible exception of v 48) may have been a Jewish Christian hymn that Luke found appropriate at this point in his story. Even if not composed by Luke, it fits in well with themes found elsewhere in Luke: joy and exultation in the Lord; the lowly being singled out for God's favor; the reversal of human fortunes; the fulfillment of Old Testament promises. The loose connection between the hymn and the context is further seen in the fact that a few Old Latin manuscripts identify the speaker of the hymn as Elizabeth, even though the overwhelming textual evidence makes Mary the speaker.
Your footnotes are not the Words of God. Nothing in His Words proclaim Mary as His mother. God does not have a mother - He is the great “I AM” -meaning He is self existent. Mary gave birth to the man Jesus - the only begotten of God, which means Jesus had no earthly biological father. Jesus was on Earth as a man who was God. 100% of each - not 50% of each. He was the Son of God from before time (read Colossians chapter 1).
Mary gave birth to the man Jesus. Jesus existed before He was conceived by the Holy Spirit. He humbled Himself and took on flesh (read Philippians chapter 2).
To say that Mary is the mother of God puts God’s existence in the hands of flesh - this is heresy. She was the mother of Jesus - the man, who has always been Jesus - the Lord of Heaven. She ain’t the mother of God.