She is definitely evil more often then not.
Of course, Shar is not Llot, most likely SH and should be mysterious. But her motives and theme Shar needs more disclosure in the game.
So far, SH does not look clear, neutral
Compared to the cleric of Llot SH, she is not only good, but generally a saint
Why is it so frightening to everyone that she is a cleric of Shar? It is not clear.
Is she really happy to be Shar's cleric, or is it self-hypnosis? It is also not clear.
Need answers in release