I'd guess that it's V3, since it certainly doesn't look like Aiko, or TY2, or Psycho (alias Jessie).   I don't recognise her as a particular commercial version, which doesn't prove that she isn't.    You could probably create your own version with the V3 Head and Body Morphs.   You need those, anyway, since most V3 sets are based on V3 PLUS the head and body morphs.