[Already being familiar with the concept of other worlds even before she came here, Celia honestly doesn't have any questions about how Melanthieae looks like she's part tree, or maybe an actual sentient tree, reasoning to herself that the woman is likely her own world's form of nature spirit or something similar. Celia herself is her own world's form of wind elemental, so if anything, the dryad's presence is something of a slightly-familiar one, even if they've never met before.

The girl already has some familiarity with how this sort of thing works, too; the last communication device she'd used was more or less a magic rock, but the jPad honestly doesn't seem to be too much different otherwise. However, familiarity with how it works doesn't necessarily mean that she immediately identifies what's what, and so she doesn't realize that the camera is way too close to her face when she responds:]

Hello! Yep, it's working!

I'm gonna guess that you've never seen somethin' like it before. It's kinda neat, isn't it?