She has to echo the word Ehail used for 'planet', because it didn't translate for her; her language doesn't have a word for those.
"Oh. We do have sky islands," she says. "Some of them are pretty large; I'm not sure how much you mean by very. Is your 'planet' geometrically square, with straight sides, or is it just lumpily four-sided in a squarish way?"
"...That's huge," she says. "I'm not even sure I've heard of an alucine big enough to hold something like that."
"That's the strangest thing I've ever heard. Do you even know where the boundaries are? You wouldn't, I guess."
"...So it's just... infinitely big? Or is it like - there's a lake outside that door," she gestures to it, "and if you travel far enough away from the lake you find yourself coming back toward it. Your super-alucine could be like that, I guess."
"I'm going to have to rethink how I understand people talking about their worlds," she says thoughtfully. "Until now I thought they meant, well, worlds. Collections of alucines, or networks of them linked by portals. But I guess they come in more configurations than that."