You presume she was assumed.
There is zero evidence either way. Absence of body does not presume assumption.
If that's the case every Christian that we cannot find a body for has to be presumed to be assumed.
You are right I have no proof, but I do have faith in the teaching of the Catholic Church that she was assumed into Heaven.
Obviously, you have no proof that this assumption of body and soul did not happen.
Furthermore, you might want to consider the words of Jesus to Peter in matthew 16.
18k And so I say to you, you are Peter, and upon this rock I will build my church,* and the gates of the netherworld shall not prevail against it. 19l I will give you the keys to the kingdom of heaven.* Whatever you bind on earth shall be bound in heaven; and whatever you loose on earth shall be loosed in heaven.”
Catholic 101
What does “The Assumption” Mean?
by Fr. Larry Rice, CSP On November 1, 1950, Pope Pius XII declared the Assumption of the Blessed Virgin Mary, which the church celebrates every year on August 15th. Simply put, the Assumption states that at the end of her life, the Blessed Virgin Mary was taken body and soul into heaven.
While this event isn’t reflected in Sacred Scripture, it is clearly part of the Church’s earliest observance. In the 6th century, St. John Damascene wrote in one of his sermons, “Your sacred and happy soul, as nature will have it, was separated in death from your most blessed and immaculate body, and although the body was duly interred, it did not remain in the state of death, neither was it dissolved by decay; your most pure and sinless body was not left on earth, but you were transferred to your heavenly throne.”
Theologically speaking, death is often understood to be a consequence of original sin. Since Mary was conceived without original sin, some theologians have wondered if Mary died, or perhaps was taken into heaven without experiencing death. The Catechism of the Catholic Church doesn’t answer this question, but simply states “The most blessed Virgin Mary, when the course of her earthly life was completed, was taken up body and soul into the glory of heaven.”
The feast of the Assumption reminds us of the unique role that Mary served in the process of our salvation. Although she was without sin, we have the possibility of receiving God’s forgiveness through Christ. Her entry into heaven prefigures our own hope of experiencing the same eternal life.