A similar entry appears in the Wheel of Time Companion confirming the information available in the main story arc.
Author: Kyria d'Oreyn
"'I saw your sister Vanora recently. She did not look well, at first. Screaming and weeping, twitching constantly and pulling at her hair. Women do suffer worse than men from the attentions of Myrddraal, but even Myrddraal must find their pleasures somewhere. Don't worry that she suffered too long. The Trollocs are always hungry.' The smile faded; his voice was stone. 'Those who disobey can find themselves over a cookfire, too. Vanora seemed to be smiling, Carridin. Do you think you would smile, turning on a spit?'
Carridin swallowed in spite of himself, and quelled a pang for Vanora, with her ready laugh and her skill with horses, daring to gallop where others feared to walk. She had been his favorite sister, yet she was dead and he was not. If there were any mercies in the world, she had not learned why." (Sammael to Carridin; A Crown of Swords, Chapter 15)