Have you had her vision checked? Seems like a good precaution.
If her vision has already been checked by a 'regular eye doctor' you may want to take it to the next level with
http://en.wikipedia.org/wiki/College_of_Optometrists_in_Vision_DevelopmentPart of me thinks it is snake oil, and part of me is very impressed with the results some families have seen, but my son is a PG/late reader, and in retrospect, I think that his eye muscles just weren't developed enough to read any earlier than 1st grade. He knew all the letters and their sounds at age 2, and was very frustrated at the time. He's 13 now! He didn't have a disability, just his body wasn't where his brain wanted it to be.
Love and More Love,
Grinity