At the end of this quest I was given the option of telling Carys to take the mirror to either Larra or Trahearne. However, when I selected Larra, I was given choice to confirm taking the mirror to Trahearne or think about it more. Likewise, when choosing Trahearne, I was given choice to confirm taking it to Trahearne or think about it. I was unable to confirm taking the mirror to Larra with either choice and had to choose Trahearne.