Forearm? Why would a perp carve a slur into someone's forearm? It doesn't make any sense. On the other hand, the forearm is the perfect place to carve a slur on one's self. (You don't run into the backward lettering problem like you do when you use a mirror.)
Cha-ching, sounds like a winner (or runner-up) to me. Funny, I haven't heard a Freeper yet who thinks that she has got to be telling the truth, although we haven't heard from Sakic yet.
As a related note: more hidden but almost as prolific in young women as anorexia/bulimia is the problem of self cutting. It's less known because it can be hidden for a long time under clothing, unlike anorexia.
It will be easy to tell if she was a "cutter" by old scars.