In your post you mention the doctor recommended Ritalin, however, what did the educational psychologist recommend? S/he should have given you some indication of where the difficulties lie and what means you of remediation are open to you (as a psychologist cannot recommend medication).
To assist her concentration, you can give her omegas 3-6-9 and follow a high protein, low carbohydrate diet. Ensuring she gets plenty of exercise and sleep will also help.
Although this will go some way to aiding her concentration, it will not overcome her current difficulties with reading and math which may fall further behind as time goes on. A remedial therapist will be able to assist in this regard.
Please consult with the educational psychologist again as to where exactly your daughter's difficulties lie so that you can begin to remediate.
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