Order of glory

"For just as in Adam all die, so too in Christ shall all be brought to life, but each one in proper order: Christ the first fruit; then, at his coming, those who belong to Christ." (From 1 Corinthians 15: 20 – 27)

In heaven, there is a hierarchy of merits. There is also a "proper order" in the resurrection of the body:

• Christ
  
• Mary
  
• Then at the end of time, everyone who belongs to Christ.
  

It is God's plan and wisdom that Mary will be raised body and soul into heaven before the general resurrection of the body. The Church has made this teaching a doctrine of faith. As it is bound on earth, so it is in heaven.

(Insight from the Mass of the Solemnity of the Assumption of the Blessed Virgin Mary)