Ooh... that looks promising. [it's not exactly a grand, gaping entrance — more like a little hole in a cliff — but it's big enough for the both of them to enter, and anyway, it's not like she's seen others (outside of crude illustrations in storybooks) with which she can compare]

I wonder if there'll be treasure — or crystals? [getting ahead of herself, there] Ah — b-but just a regular cave full of rocks will be interesting too! Maybe there'll be some interesting plants inside...