Viconia Devir is in BG3 and she leads the Sharran enclave. She is very much alive at the start of act 3 and remains so unless Tav and company kill her.
So the events you posted up there are emphatically not true in the BG3 version of events (unless she was ressurrected).
In either case my point, relative to the original topic, is that she is a loyal Sharran, and remains loyal to Shar from the end of BG2 through the current game.
Viconia DeVir is a drow cleric of Shar.
bg3.wiki
Also, it appears Faldorn has also remained true to her Shadow Druid religion. Although she does not appear as a character in the game, she is mentioned in the Shadow Druid quest in BG3 and is apparently still alive and trying to spread shadow-druid stuff. This would also mean she was not killed by Charname or Cernd in the Druid Grove near Trademeet in BG2.