Shadow of Betrayal (a Ninja Assassin fanfic - Maybe discontinued?)

Celeste is your average Canadian teenager. Except for the fact she can cross the dimensional rift alive. And the fact the U.S.A. is out to get her. And possibly even how she's a Ninjas apprentice. But when one BFF betrays her, her whole gang starts doubting themselves. To make matters worse, inside arguments are breaking out. Can she save everyone she loves, or will it be too late?