She is blind. She uses her own aether to help her see things. Everything is made up of aether. It's why Matoya tells her that it'll kill her one day. Though so far the devs haven't shown what kind of toll it's been taking on her. She probably just wanted Urianger to give a poetic version of what the night sky looked like on the 1st. These types of questions are best suited for the Lore section of the forum. I do believe there was/is a thread that talks about this topic in that section.