The birth of the Messiah certainly culminated in Mary's conception and delivery of the Son of God incarnate, but she was far from the ONLY one involved in that lineage. Perhaps you need to read Hebrews chapter 11 to appreciate the history of all the faithful ancestors that made up the lineage of Mary and Jesus.
If you insist that it is Mary spoken of in that chapter, may I assume then that you also concede that when Mary gave birth to Jesus she "cried out in pain as she was about to give birth"? Do you concede that pain in childbirth is part of the curse of sin? Do you concede that Mary had additional children/offspring and that the Dragon went off to wage war against them? These WERE parts that I forewarned you would have to be accepted should Mary actually BE the woman spoken of in Revelation 12. What do you do with them?
I insist you cannot exclude Miriam from Revelation 12, just as you cannot exclude Yeshua from Isaiah 49, et al. As for the details of Yeshua and Miriam's lives, I just don't know. I look forward to learning all of it one day that is pleasing to the LORD. If I don't have faith yet to believe something I ask the Holy Spirit to help me believe what is true. The Catholic Church has explanations for many items, and on others is patiently silent. I know I have many questions. How did those who call themselves Christians end up in the mess we are in ?