Yes, we do.
This along with the "Queenship of Mary
Rev 12:1 record the fact that Mary was in heaven, bodily. And the fact that she wore a crown of 12 stars. Thus, recognizing her as Queen.
have never made much sense to me.
Well, Jesus loves His mother so much, that He immediately brought her to heaven.
And, the Mother of a King is a Queen. Thus, the mother of the King of Heaven is the Queen of Heaven.
They aren’t described in the New Testament
nor any extra canonical books of the New Testament.
Yes, actually. There is a book which describes the fact that Mary swooned, the Apostles were called back from the ends of the earth and when they arrived, she was gone and there was a hole in the ceiling. Hm? I tried to find it, but instead I found that, according to Wikipedia, there are a whole slew of books from the Early Church, precisely about the Assumption. Look at the history section.
( The Immaculate Conception is at least described in the Protoevangelium of James) I believe it because the Church says so and I trust the Church but I tell you some of the beliefs on Mary are hard. And the readings regarding these Solemnities really have absolutely nothing to do with what is being celebrated but metaphor.
On the contrary, the readings are precisely about that which is being celebrated.