Like every other part of the Bible, God tells us what we need to know and what He wants us to know. He does not always tell us what we want to know.
Christ the King is Biblical, therefore Mary as "Queen Mother" is also.
Problem with reformed protestantism is the irrational rejection of all things catholic; even the good parts such as valid Marion theology, the commemoration of the saints, efficacy of the sacraments, and liturgical worship. All of which are supported by Scripture, and by the apostolic teachings from the 1st through 3rd century. Most Protestants Just throw the baby out with the bath-water, and trade faith for works righteousness, legalism and pietism, and drop the ball on Christ's gifts of grace given not only in the Word, but in the Sacraments.