Yeah, that sounds like a problem. Yin registers the fact with her usual lack of expression gaining a mild, perhaps noticeable frown as she asks, "A tonberry does not speak?"

She might still look for it, though, using her specter.

If Yin couldn't get her to speak, then that was okay. After all, Yin felt no strong emotion to get information out of this unknown woman. Just a simmering curiosity that she shouldn't be able to feel in the first place.