It seemed that the shopkeeper didn't know either Old or High Realm, for he responded to her, and while she couldn't reveal that she knew Skytongue, she would be able to reasonably infer from his tone and body language that he was saying: "I'm sorry, miss, I don't understand what you're saying."  However, there<em>was</em>someone in earshot who did understand what she was saying.  No sooner was she done speaking in High Realm than the heads of the pair of Dragonbloods turned in her direction, having heard a familiar language.