Yes that was my feeling: that Morgana (at the least) was one of the steps which led to Vilja. But now I know there are several others who combined into her personality, how neat.
I've been playing Morrowind for a month or so, same three ladies from last year: 1).
Ana Khannda (Dunmer bowwoman; House Hlaalu, Thieves Guild, Dunmer Temple)
2).
Fay Daway (Bosmer magician; Mages Guild, House Telvanni, can't remember what else)
3).
Joan of Arkay (Breton crusader; main quest, Imperial Legion, Imperial Cult, Fighters Guild)
Fay's and Joanie's names are picture links.

I switch between those three from game session to game session.