Carly is coming in hot herself-well, not literally, but the hummingbird seems to move so fast it's molting feathers, finally shifting to standard form and landing to stare with wide eyes.

"AH- Sh...She really did leave a pile of ash..." she observes somewhat dumbly, staring to the egg. Being just in time to hear the word 'phoenix', she looks to Sans. "Mnnh, if she's a phoenix, I guess we just wait for her to hatch then... ...but we can't just leave her egg here can we..!?"

A pause, and-

"...She'd probably like some kind of party, too..."