She was originally member of the Order of the Ermine Mantle in M41. Eventually became Abbess of the Adepta Sororitas, but mysteriously vanished during pilgrimage to San Leor. After disappearance, the post of Abbess has remained vacant.
Later in the Age of the Dark Imperium Sabrina's fate was revealed. She had become trapped on San Leor, battling Daemons and the Alpha Legion. Though a century had passed, they were kept alive due to the powers of the Warp and a church bell which emanated with the powers of the Emperor. In the final phase of the Battle of San Leor Sabrina and her Sisters were rescued by Saint Celestine and her forces and she resumed her duty as Abbess.