[Kotori has had the...honour of being in the garden a few of the times Shun's set the vultures on Hibiki. So while she doesn't recognise the goddess by appearance, she certainly recognises the voice, and she puts on a somewhat steely, but still polite smile at the reaction.]

You could always come along to confirm it yourself. Of course, if you don't mind the company of Keba and the other vultures...