She was thrown out of the castle because she was not good enough to live there. She secretly started living in the undercroft of the castle and started taking control of the Death Hounds that live there, plotting revenge.
When the Dragonborn travels to the undercroft with Serana, the Feral Vampire will attack together with her Death Hounds.
She carries a Journal Fragment.
- There is a glitch where if the Dragonborn is a werewolf and waits too long to kill her, a message will appear saying vampiric powers recede as the Dragonborn feeds, and will gain the powers and negative effects of being a vampire. Still nobody will recognize the Dragonborn as a vampire and is still considered a werewolf.
- The Elder Scrolls V: Dawnguard (First appearance)