The problem with the term Dyslexia is that it is used to describe a condition which can have numerous causes. Some dyslexics do have visual problems which can be improved by the use of tinted lenses, others have problems with distingushing and identifying sounds, some have short term memory problems. It takes a great deal of time and effort to improve their spelling. They are best working regularly in short periods as many of them find the process very tiring Synthetic phonics is an excellent programme. There is also evidence that practising and improving other physical skills- hand-eye co-ordination,through juggling, balance, through exercises can help.
The good news is that as she gets older she will have a wide range of IT support. My son who is dyslexic has a spell check on his lap top which recognises words by their context as his attempt is sometimes unrecognizable to a normal spell checker. He has a voice program which reads text when he is very tired and struggling. He has just completed an MA. Dyslexia also often brings talent and skills in other areas.