I'm confused as to whether she is completely blind but able to sense aetherial flow of all forms of matters or is she half blind and has limited vision.

In ShB, right after the 3rd LW battle she asked Urianger to describe the sky to her in the most Urianger-way. But then in the cave she is able to tell the murals are from certain era, when asked she says it's the peculiarity of the paint used gives it away.

What is with her vision?