What modern science has proven is that, in a process known as microchimerism, cells from the fetus colonize the mother's body and remain within it through the rest of her life. That means that from the moment the Holy Spirit came upon her until her dormition she carried the still living cells of Jesus. If we believe that Jesus' body ascended into heaven we have to accept that Mary would eventually accompany Him.
Peace be with you.
LOOK!
There goes MARY!!!