Unlike Fate: Inconclusive or Fate: Presumed Deceased where there's some implication that she got (or will get) some kind of comeuppance, a karma houdini is when the villainess outright disappears from the story, Sure, she may have faced a setback or too earlier in the plot, but the credits are rolling and for all we know, she could be sitting on a tropical beach somewhere, living the high life until the day she dies of old age!