Why do people call the Mary the queen of heaven?

this is not a title the Bible uses. The Bible treats Mary more like a person, and she's given relatively little air time in the New Testament. It's not like the Bible is actually about Mary, she is not foretold as the One who would come and save the people from her sins, she is not the One who would die and rise again, she is not the One who would heal many, cast out demons and calm the storm, teach, suffer and ascend.