If there is choice Nightsong or Halsin, I'd kill Halsin every freaking time. Also I love her look with silver hair(I've heard somewhere though that she is supposed to be silver-haired instantly after the shadowfell, because Shar tortured her till her hair turn white).
I thought it might be related to her turning into a Cleric of Selune, because the game says she's now empowered by Selune (in the dialogue after the Nightsong), but that's certainly possible. She went through a lot while leaving the Shadowfell, Shar did not hold punches based on how she explains it. The pain that poor girl suffered just to be with Tav (and to rid herself of Shar's influence, of course).
All the more reason to believe the inconsistent interactions should be removed/changed, I'd say!
