ANSWER:  Her body!

Unlike Mary, other souls in heaven will have to wait until the Last Day (Judgment Day) for the reunification of their souls and bodies, which will separate at the point of death. 

Mary, who God ordained would come into the world like Eve (without original sin), never sinned during her life. God took her into heaven, body and soul, at the end of her Earthly life.

Of course, Jesus also has his Body in heaven. Unlike Mary, who was “assumed” into heaven by the power of God, Jesus ascended into heaven by virtue of His own power.