She is not a priestess of Lolth (unless the absolute is an invention of Lolth), but a priestess of the absolute. I guess designs for absolute Armor (except for a few goblin items) have not been finalized yet.
I also think that she is too weak for the role she plays in terms of level but

game files suggest a coming drow companion. If that is going to be Minthara it is understandable that she is only level 5.

Most of the world currently seems stuck at Lvl 5, a few stronger creatures would be manageable