Hey, thanks for your reply Laurentius.
Yup Yuxomonei seems pretty correct. As does Icasaracht from the description. Only thing that doesn't fit Icasaracht is that she was Wylfdene at the same time. The seer was talking about Wylfdene, then she mentioned 'other' women and mentioned these 4... seems kind of weird that the main antagonist and the person you came to talk to her about is thrown in among other three "less" important ones.
But yes, from the description it does seem that Ica is the best bet.
Presio is a woman..? Always thought it was male.
And yes I agree, this is one great scene. For a game that's heavily hack-and-slash and combat oriented, IWD does have some excellent dialogues. This is definately one of them.