Arya was clearly perturbed by the play she saw and we know she still has Needle buried in some rocks, so we're left to believe a girl is still someone. Yet we see her drink from the bowl of poison water and Jaqen says something like "If a girl is truly no one she has nothing to worry about". So the question is: Are the gods easily fooled, or is Jaqen testing her commitment further? I'm not sure what to make of it.