Carla is a woman in West Ardougne who is upset that she lost her son to the mourners. She claims that it seemed more like the common cold rather than a horrible disease that is affecting the city, and that it is made into such a big issue by its neighbouring city, East Ardougne.
Carla is one of the few people who suspect that the plague is a big hoax (Carla is right, as seen at the end of Biohazard, that there is no plague after all). One way to tell her apart is that she wears a bright purple dress which stands out from the drab, brown clothing worn by the rest of West Ardougne.
In the Song of the Elves, she is part of the Resistance and suggests riling up citizens by telling them that their food will be confiscated.