Yvenna was a terran who followed anti-Dominion rebel/terrorist Cliff Nadaner. She knew that many of the stories he told about his past deeds were false and/or exaggerated but liked hearing them nevertheless. While on Tyrador VIII, she and the rest of Nadaner's band were killed by a Dominion ghost.
References
DeCandido, Keith R. A. (November 28, 2006). StarCraft: Ghost: Nova. Simon & Schuster (Pocket Star). ISBN 0-7434-7134-2.