Question: has arya used her coin?
Answer: Impressed by her moxie, Jaqen gives Arya an iron coin, and says that if she presents it to someone from Braavos and says the customary greeting—“Valar Morghulis,” high Valyrian for “All men must die”—then the Braavosi will grant her one wish (not murder, necessarily, though it's always an option).