No... and i explain you why like i said elves mature slowly they are considered to be of major age when they hit the 100y treshhold.
In her dialog, where she speaks of her rite of passage into adulthood, she also mentions that she had slept with countless males before.
I think you're projecting modern, human concepts of what is and isn't maturity.
Now lets assume is like you say and Viconia becomed acolyte of Lolth when she was like 75 or 80
First, I never said this.
The game says she was taken to serve as a child. It doesn't specify her age.
time spent to become a total priestess that would had been also quite some time as well.
Again, citation needed on the age of a priestess in Drow society.
Then fall of house de vir escape in to the surface becoming acolyte of shar to then become a priestess of shar. That is a huuge time gap to cover.
For a human, not for a Drow.
I will add that sacrificing infants to Lloth is common. For her to have balked at that as a priestess tells me that she wasn't a "total priestess", as you say, of Lloth for very long.
then become a priestess of shar.
She's a level 2 cleric lmao.