Mary is not the mother of God.
Mary is the mother of Jesus.
Jesus is the Son of God, NOT God the Son.
Luke 1:26 And in the sixth month the angel Gabriel was sent from God unto a city of Galilee, named Nazareth, 27 To a virgin espoused to a man whose name was Joseph, of the house of David; and the virgin’s name was Mary. 28 And the angel came in unto her, and said, Hail, thou that art highly favoured, the Lord is with thee: blessed art thou among women. 29 And when she saw him, she was troubled at his saying, and cast in her mind what manner of salutation this should be. 30 And the angel said unto her, Fear not, Mary: for thou hast found favour with God. 31 And, behold, thou shalt conceive in thy womb, and bring forth a son, and shalt call his name JESUS. 32 He shall be great, and shall be called the Son of the Highest: and the Lord God shall give unto him the throne of his father David: 33 And he shall reign over the house of Jacob for ever; and of his kingdom there shall be no end. 34 Then said Mary unto the angel, How shall this be, seeing I know not a man? 35 And the angel answered and said unto her, The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God.
The teaching that Mary is the ‘mother of God’ comes from the false doctrine of the trinity where Jesus is falsely said to be ‘God the Son’, part of a triune God.
Jesus is in this way supposed to be ‘God’, and therefore Mary his mother is acclaimed as the ‘mother of God’.
This is complete nonsense unsupported in the Bible.
What is also false is the teaching that Mary ascended to heaven and can intercede for others.
Mary, along with all the faithful who have died, sleeps in the dust awaiting the return of Jesus to the earth and the resurrection from the dead.
1 Corinthians 15:20 But now is Christ risen from the dead, and become the firstfruits of them that slept. 21 For since by man came death, by man came also the resurrection of the dead. 22 For as in Adam all die, even so in Christ shall all be made alive. 23 But every man in his own order: Christ the firstfruits; afterward they that are Christ’s at his coming.
May I suggest that you read:
Jesus: God the Son or Son of God? https://www.thisisyourbible.com/library/show/169
I hope you find this helpful.