She comes from an ancient time when all the world was in darkness. Such a sad story. Her baby son wandered off into the gloom and she has never been able to find him.
So every day she takes her burning torch into the sky to shed some sonlight and carry on the search. What you feebly imagine to be the sun is really just her gigantic flashlight.
If her son is ever found, the world will be plunged back into eternal darkness. Which is a little worrying.