Sophia's target was a vampire, a blasted, cursed, reckless vampire, with an appetite for young girls.
So when she spotted said vampire prowling the streets, she stalked it, waiting for something to distract it so she could teleport in and distract it.
It attacked a young woman who was quick and defenceless. Sophia decapitated her corpse to avoid he becoming a vampire, then placed her on a pyre. By the time she got back onto the vampire's trail, it was already attacking another woman.
She teleported in tucking her hair away for safety, and grabbed the vampire, throwing it, and teleporting after it. She was quiet, and silent. By the time it could figure out exactly what was happening, it's head rolled off it's shoulders and onto the cold cobbles.
Her employer wanted a tooth to ascertain the kill. She would bring it's head.
She opened her satchel, threw the head in, and looked over at the victim, her eyes shining in the moonlight.