Technically, Layla hasn't killed anyone. Ask the witnesses. It was a misstep here, a trip-and-fall there—accidents happen.
And Layla is paid very well to ensure that they do.
Her mother once traced their lineage back to ancient times. Go flip through The Odyssey. Some great-great-great grandmother is in there beckoning sailors to rocky deaths. For eons her kind has made it their business to bring hapless men to quick and messy ends. Layla can't help it that Saint Roch City has job listings for someone who can cause blameless death. You go where the work is.
When the most difficult hit of her career goes sideways, Layla finds out that what she's been told about her own history may not be so accurate. And there is no forgiveness in the business of assassinations. When you're paid to kill someone, there better be a dead body.
Either the mark's—or yours.