Those who keep the commandments of Christ are not Mary's seed, they are counted as Israel's seed -- heirs according to the promise.
Mary, Israel, the Church -- these are all intertwined ideas. To try to separate them in the twelfth chapter of the Apocalypse or anywhere else is misleading.
Revelation 12
1And there appeared a great wonder in heaven; a woman clothed with the sun, and the moon under her feet, and upon her head a crown of twelve stars:
The woman here, who gives birth to Jesus is clearly Mary. "Birth pangs" here refer not to the physical labor in giving birth of Jesus, for birth pangs are a consequence of Original Sin, from which she was saved; but rather to the spiritual labor she endured giving birth to the Church while Jesus hung on the Cross. But Mary also represents the Church because what the Church is, is exemplified in her.
Mary is both a daughter of Jerusalem and mother of the Church, the two ideas are not in conflict.
Galatians 4
26But Jerusalem which is above is free, which is the mother of us all.
This is the verse which opens the Fifth Glorious Mystery -- the Crowning of the Blessed Virgin -- in the public Rosary before Sunday Mass. Ironic that you would use it to try to show a distinction between Jerusalem and Mary.
The Jerusalem which is above is not the physical, earthly city of Jerusalem. Rather, Jerusalem here represents our Heavenly home:
Gal 4:22-27 said:
For it is written that Abraham had two sons: the one by a bondwoman, and the other by a free woman. But he who was of the bondwoman, was born according to the flesh: but he of the free woman, was by promise. Which things are said by an allegory. For these are the two testaments. The one from mount Sina, engendering unto bondage; which is Agar: For Sina is a mountain in Arabia, which hath affinity to that Jerusalem which now is, and is in bondage with her children. But that Jerusalem, which is above, is free: which is our mother. For it is written: Rejoice, thou barren, that bearest not: break forth and cry, thou that travailest not: for many are the children of the desolate, more than of her that hath a husband.
Mary is prefigured in the Old Testament by the Holy Mountain, Jerusalem, the Temple, the Ark of the Covenant, Judith, Esther, Eve, Sophia, and many other people and things. Some of these prophecies can only be understood in the light of faith, reading Scripture as the Church has read it through the centuries.
Also, Jesus himself did not revere his own mother Mary on a level higher than any other who keeps his commandments.
Are all people on the same level? No. Some people are given more opportunities for advancement than others -- this is the mystery of election. Some people respond to more of those opportunities than other people. Every grace was offered to Mary and she responded to every grace. That is how she advanced higher than anyone else, to take the place Lucifer would have held.
Mt 20:20-23 said:
Then came to him the mother of the sons of Zebedee with her sons, adoring and asking something of him. Who said to her: What wilt thou? She saith to him: Say that these my two sons may sit, the one on thy right hand, and the other on thy left, in thy kingdom. And Jesus answering, said: You know not what you ask. Can you drink the chalice that I shall drink? They say to him: We can. He saith to them: My chalice indeed you shall drink; but to sit on my right or left hand, is not mine to give to you, but to them for whom it is prepared by my Father.
Who are the two individuals who were prepared by God to sit at the right and left hand of Jesus -- the highest and second highest place after Christ Himself? None other than the Mother of God and her Protector -- the Blessed Virgin Mary and St. Joseph.
Mary was the vessel which God used to bring forth our savior. She is not married to Jesus, our King, who is the King of us all, and of heaven, and the angels, so she cannot be Queen.
Matthew 22
30For in the resurrection they neither marry, nor are given in marriage, but are as the angels of God in heaven.
Mark 12
25For when they shall rise from the dead, they neither marry, nor are given in marriage; but are as the angels which are in heaven.
Mary is, however, Mother of God and therefore the Queen
Mother, which in Jewish terminology is called simply the queen.
But, furthermore, you have a problem saying that there is no marriage in Heaven.
Apoc 21:2 said:
And I John saw the holy city, the new Jerusalem, coming down out of heaven from God, prepared as a bride adorned for her husband.
Mt 9:11 said:
And Jesus said to them: Can the children of the bridegroom mourn, as long as the bridegroom is with them? But the days will come, when the bridegroom shall be taken away from them, and then they shall fast.
Many times Christ refers to Himself as the Bridegroom. In the Book of the Apocalypse, we see the Heavenly Jerusalem, understood to be the Church, personified as Mary, as the Bride of Christ. Christ refers to the Kingdom of Heaven (as we read in the Gospel this past Sunday) as The Wedding Feast of the Lamb.
Mary is indeed, the most glorified and blessed creature in all of Creation, chosen from before the formation of the world to be the Mother of God. As she gave birth to Christ's physical body, so too does she give birth to Christ's Mystical Body.
St. Louis de Montfort said:
"This man and that man is born in her" (Ps. 86:5), says the Holy Ghost through the Royal Psalmist. According to the explanation of some of the Fathers, the first man that is born in Mary is the Man-God, Jesus Christ; the second is a mere man, the child of God and Mary by adoption. If Jesus Christ, the Head of men, is born in her, then the predestinate, who are the members of that Head, ought also to be born in her, by necessary of consequence.
One and the same mother does not bring forth into the world the head without the members, or the member without the head; for this would be a monster of nature. So in like manner, in order of grace, the head and the members are born of one and the same Mother; and if a member of the Mystical Body of Jesus Christ - that is to say, one of the predestinate - were born of any other mother than Mary, who has produced the Head, he would not be one of the predestinate, nor a member of Jesus Christ, but simply a monster in the order of grace.
She who gave birth to the Head must necessarily be the one to give birth to the Body. Just as we have a physical mother and father, both immediately (our biological mother and father) and ultimately (Adam and Eve), so too do we have a spiritual mother and father (Mary and God). She is our Mother and our Queen.