Gudren was the handmaiden of Katherine von Swartzschild.
At the age of fifteen, Katherine became very ill and it was presumed that her death was imminent. Unwilling to watch her suffer from her illness, Gudren paid a desperate visit to an Old One named Klaus and asked him to cure her. Although Katherine had no say in the matter, Klaus agreed to help by transforming her into a vampire.
- In the TV series, Gudren’s character was replaced by Emily Bennett.
- While Gudren was human in the books, Emily was a witch in the TV series.
- Gudren helped Katherine fake her own death in the books, while Emily helped protect the vampires who were intended to be burned by magically sealing them inside of a tomb to save Katherine's life, not knowing that she had been freed by George Lockwood.
- Gudren refers to Katherine as "mistress Katerina."