In "The Courier's Calling" quest after convincing Tuaha in Port Maje to take the missive without dealing with her stalker it is said later that she leaves due to complications in her mission. Yet in the ending slides it is shown that she still assassinated both governor Clario and Huana village's leader.
Here's a save file just before the ending slides:
https://drive.google.com/open?id=1FQe9-d8DdY-UtRdcN3Q1cxJ7L9WGhZSP
Also, if the player simply attacks Tuaha, nearby Dawnstars shout that she's one of their own and turn hostile.