First go read what the doctrine says pay close attention to the phrase “ merits of Jesus Christ”
Then please go research where the relics of Mary are kept and venerated. ( I am not asking you to believe in them, but keep in mind the relics of Saints are kept and venerated by the faithful. It is a great honor for a Church to house the relics of a saint. So they do tend to let word get out they have them)
Then read a variety of concordances on the meaning of the phrase “ full of Grace”. To be thorough start with the question of how the Greek phrase “Kecharitomene:” is properly understood and translated. There are disagreements but I think it important you get a chance to examine all sides.
Then if you want. (I wouldn’t) you can read about the debate between different Schools of Theology about whether Mary was without original sin as well as personal sin or only without personal sin. It may be enough to read how the writings of Don Scotus helped answer the dilemma of if all have sinned and come short of the glory of God, how then could Mary be without original sin? Didn’t think the Church had thought of that little glitch did you?
Then please look up the definition of Assumption and contrast it to the Ascension. They are not the same and anyone who trys to give you an understanding that they are needs a swift kick in the ass.
Ok after all that come back and ask your question again edited to reflect what Catholics truly believe and what the Marian doctrines you allude to actually say.