Of course it’s all assumed.
There’s not a mention of Mary anywhere in Scripture after the beginning of Acts.
The Bible is totally silent on what happened to her.
Which means that we don’t need to know.
There's a lot of people in the Bible who we don't hear about after their appearance or their book. That doesn't mean they aren't important.
And, just to be honest, it has become very important to discover names, dates, and locations. Archeology has helped to stifle the attacks of the atheist enemies of the gospel.
If we DO 'need' to know; is that not an indictment against the RCC?
Doesn't IT claim that it had the Authority and Power to assemble the BIBLE as we have it today?
WHY did they LEAVE THIS STUFF OUT when they had the only game in town for 1500 or so years?
Yeah; I know. One will now chime in and assert that them DAMNED Prots took out books from the bible.
But, when the evidence is produced of those missing books, MARY ain't in them; EITHER!!!
“Which means that we don’t need to know.”
Good little sheep never ask any questions of their betters.