Wow is she suddenly really grateful she's already been told that there are people who aren't human around here or she'd look extra dumbfounded. You know, more than she already kind of does because 'like a human' was not what she would've expected for someone not human.

"You've gotta be yanking my—" Nope, that's rude. She catches herself. Give her a moment, accepting this into her worldview. "Right. Okay. Gotcha. You just don't look like any machinery I've ever seen."

Is that much less rude? Arguable.