Shadowheart just with all its appearance asks "give me a quest in which I will determine who I am"
Shar сleric cannot be truly neutral, or not?
She does not act like an classical netural evil character, she behaves as if she had started worshiping Shar in an attempt to fill the inner simplicity, or get rid of the bad life that came before
Nees have to do something about this, and make her Alignment depends. For example, after the quest where Selune and Shar will be in conflict seems the best solution. Or any other way, the way is not very important. It was with Viconia in Baldurs Gate 2, and here we can go even further.
She is very cute and seems hidden submissive, can be disappointed in the Shar (?) and become good, or she can become a bitch, or remain as she is, if the player likes "neither fish nor fowl".
The main thing is that this "neither fish nor fowl" does not become the only possible option, the potential to make from SH exactly what the player wants to see is optionally very large. It would be a very interesting experience, I want to see this in the game.
We already have the "evil" lae'zel, as well as the drow Mintara, Mizora (the demon girl in the art with Will) who will obviously be companions in the release, and not a single good girl. The option for Shadow Heart can to repent and change alignment to neutral good (if the player wants to, can be made she a cleric of Selune), or help strengthen her faith in Shar and change to neutral evil.
Or if she be true neutral after personal quest...
Dark moon heresy?