Isobel Watkins

Isobel Watkins was a photographer and the niece of Professor Watkins. She was staying at the home of Professor Edward Travers when she met the Doctor, Jamie and Zoe. She assisted in the defeat of Tobias Vaughn and the Cybermen. (DW: The Invasion)

When Watkins went public with her story, C19 began harassing her, telling her to keep quiet. Her claims that Earth had been invaded by aliens were not believed, and her photographs of the Cybermen were dismissed as fakes. Months later, she was interviewed by James Stevens, who was investigating UNIT. (MA: Who Killed Kennedy)

Behind the Scenes
The events of Who Killed Kennedy can be viewed as a slight retcon, as The Invasion ended with her getting a lucrative job because of her photos of the Cybermen invasion.