Yes! She was the girl that Charlie used to make the waitress jealous in the cruel intentions episode! I needed to use her after watching Why Women Kill, but I am a useless wealth of Sunny knowledge. :D
My initial inclination for this one here was to have a former nanny/daycare worker whose first zombie kill was a kid or three, and the experience has left her understandably off in the aftermath. A formerly eternal optimist sort who has found herself in the Bad Place, with all sorts of cause to question the good in what's left of humanity.