[Well at least she's sitting down! That's a start. Now how does he sum up one of the most difficult experiences of his life in a way that's age appropriate?]

Well, first of all, you can't eat stars. They're actually massive balls of burning gas that are billions of miles away. [And the ones in the sky here are fake anyway.] So if I brought one of those here, it would kill all three of us. I don't think Jinora would like that.