She was a little surprised at the sudden kiss, but not too surprised, she did know Apollo after all, but when he said he knew where Clio was, all she could say was, "GO!" urgently, and stood still, watching him disappear. She did not smile at his final words, but closed her eyes for a moment, clasping her hands together in hope.
Well. It seems all Apollo needed was some firm words to boost him after all. Calliope would take that as a win, and head home again to make breakfast, and make sure her phone was set as loudly as it could be so she didn't miss the promised call.