You could also try giving her a food supplment , it has been noted recently by experts that all children and especially those with learning and concentrating difficulties , benefit from a multiple Vitamin-mineral supplement with antioxidants,,B Complex and Vit C also fish oil has benefits.It has also been noted that food supplement treatment may also have the same efficacy as Ritalin ,given out by Doctors to treat ADHD.Worth a try I think.
I would speak to her physician about it. He would be the best one to help see if there is a problem that needs to be addressed