I also have full confidence in those who wrote, translated, canonized and handed on to us, the Book.
Context is very helpful--- essential --- in this regard. There is as much about Mary in the prophecies, multi-valent foretellings and types of the OT as there is in the NT. It goes from Genesis to Revelation. I have an intense interest in the biggest context you can comprehend. Bigger than either of us can comprehend.
You only see Mary, as you describe her, in the OT if you allegorize Scripture which is exactly what the RCC has done. It stems from a form of Gnosticism in which the reader believes he/she can see something others cannot.
In doing so you depart from the actual meaning of the text in that the text can't mean more than the author intended.
It is not sound Biblical exegesis and those who practice it fall into error.