Clio's hearing isn't anything compared to GG's, but after a few seconds she can hear the sobbing as well, barely audible but definitely there. She doubts it's another guest or model, there's a difference between someone crying because they're scared, and someone crying because they're sad. This sounds like the latter.

"I can hear it," She slips into French automatically, responding to what's spoken to her, "It's something like death. Can you find the source?"

She might be able to follow the feeling of not-quite-right, but GG following her ears is probably quicker and easier. And while she waits for an answer, Clio takes off her jacket, setting it down gently on a pew; if she has to shift or turn intangible, the jacket wouldn't change with her and it's better to leave it behind.