Glad to hear you figured out one element of the story. Don't feel bad that you didn't catch the vision earlier. When our #1 finally got corrective lenses, one of the first comments I heard was, "Now I don't have headaches anymore!" To which my first thought was, how long had there been headaches without my knowing about it? ! Apparently for several months, which doesn't, of course, include the period of time when glasses were probably in order, but it wasn't causing sufficient eye strain for headaches to be in play.
Give her a few weeks with the glasses and see if you observe any changes in behavior or preferences regarding visual-spatial tasks, reading, writing, etc.
