When your son is King, you are generally a queen.
This is particularly true in societies where the king had multiple wives. The King in that case would not designate a wife as queen because he could never be sure that his "son" was actually his. Instead, in pluralistic societies, the Queen was the Mother of the King. See The relationship between Solomon and Bethsheba as an example.
I would presume that Scripture would have a little something to say about it if theologically Mary is the Queen of Heaven.
Fact is, she simply isn't. She never was and never will be in the future.
She is somebody we should look up to......she brought the Savior into the world! Too often Protestants ignore her almost.
But, she isn't the Queen of Heaven.