Isabelle had aspired to be rich, and wanted to achieve this by working as a thief. However, according to Vex she had lacked the skills to become one. Vex later sent her to Hob's Fall Cave, where she was slain by Necromancers. Her lover, Ranmir, began to believe that Isabelle had left him after her disappearance, as he had never learned of her fate, and thus spends his time drinking in the The Frozen Hearth in Winterhold.
A letter can be found on her corpse, which was meant to be sent to Ranmir before she traveled to Hob's Fall Cave.