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The weakness on one half of the body referred to as Hemiparesis
is usually indicative of a problem in the brain, usually strokes like in the adult. Since there is difficult to stand on the heel could point to the fact that this problem has been long standing probably from birth. It could be due to a blocked artery
in the brain, a tumour mass compressing structures in the brain or other reasons. By the MRI
will be able to find out the cause for this and help treat the condition. I would like to point out that in such long standing cases, some drugs will help maybe as muscle relaxants to help her walk better and to prevent seizures, but Physiotherapy
to strengthen the muscles is the most important. After the Diagnosis the Neurologist will explain the options available for treatment. Do have hope. This can be treated to work in the best for your daughter.