Do you accept that Mary believes in her Son? If so, then she is not dead. She is alive.
Joh 3:36 - He who believes in the Son has eternal life... [present tense]
Joh 5:24 - Truly, truly, I say to you, he who hears my word and believes him who sent me, has eternal life [present tense]; he does not come into judgment, but has passed from death to life.
Joh 6:47 - Truly, truly, I say to you, he who believes has eternal life. [present tense]
1Jo 5:13 - I write this to you who believe in the name of the Son of God, that you may know that you have eternal life. [present tense]
Each of these passages speak to the undeniable Scriptural truth that those who are true followers of Our Lord and Savior Jesus Christ have eternal life. Eternal life is life that does not end. Thus, Mary and the other followers who have fallen asleep in the Lord are not dead - they are alive. This is good news! Christ Bless.
No more; no less.