Not only women prefigure Mary. One of the recurring analogies to Mary in Orthodox hymnody and theology is as the burning bush. As the burning bush was aflame with the light of God, yet not consumed, so also was the Theotokos filled with God, yet (a) not burst asunder, and (b) not only that, but her virginity remained even in giving birth to God. Another example, and a very good one too: the Ark of the Covenant. As the Ark carried the old covenant, so Mary carried within her womb the new covenant. Tradition carries this analogy so far as to give us the story that, upon arriving at the temple to stay (as the consecrated firstborn of Joachim and Anna), the high priest assigned her the Holy of Holies for living quarters (at that point, the Ark was lost).
One would presume that the closer one is to Mary, the more often the Holy Spirit will inspire us to see her prefigured in the Old Testament, just as the closer one is to Christ, the more illumined with His Light the Old Testament will shine for us. Does that answer your question? You will see Mary in the Old Testament if the Spirit leads you to find her there, just as Christ makes Himself known therefrom as well.