Can you point to that passage of Scripture which describes the death of the Blessed Virgin Mary, for starters?
If the Assumption of the Virgin directly into heaven without dying is a fact, then she and she alone (well except for Enoch and Elijah) would represent ostensible exceptions to the admonition re: necromancy (though I am not capable nor worthy to clarify that admonition beyond what any of us can read in Scripture).
Ah: Argumentum ex silencio?
Oh, and where, pray tell, is the Scripture telling us of her “Assumption?”