A similar entry appears in the Wheel of Time Companion confirming the information available in the main story arc.
Author: Kyria d'Oreyn
Rodel Ituralde meets the Dragonsworn at her abandoned hunting lodge and recalls that she was famed for her wild hunts. Her "trophies" were men and power, but to his knowledge, she vanished during the troubles in Arad Doman - he does not know that she is being kept by Graendal (CoT, Prologue).
"Her hunting had always been for men or power, her trophies numerous and noteworthy despite her relative youth, and the "hunts" that had taken place here would have raised eyebrows even in the capital." (Ituralde about Osana; Crossroads of Twilight, Prologue)