could be dyslexia, but could be a whole host of other things. best to speak with a professional.
what u should do as a friend, though, is give her the support she needs (although im sure u do already, which is why u posted at this board) and let her know that she is smart as dyslexia is not a sign of lacking intelligence at all. in fact, there are many geniuses with dyslexia, and many successful famous people (whoopi goldberg, for one.)
U sound like a great friend and its really nice to meet sweet people like u who r concerned about their friends as you are.