Darra can be found at Moonrise Towers undergoing a trial Ketheric Thorm for her failures, if Minthara or Fezzerk do not survive Act One. In this case Darra is accompanied by Drenn and Racha.
It is not possible for the party to speak with any of the goblins outside of the cutscene. The player character has several options for deciding their fate. If the party set them free, the surviving goblins flee from Moonrise Towers and disappear.