Hypotonia, CP, genetic syndrome
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I would check if amino acid and urine organic acids were performed. If there is a hint that a metabolic process is going on then a muscle biopsy might (might) want to be considered. In our experience, hyptonic CP exists but it is rare. We often find a metabolic etiology in this condition. Either a congenital myopathy or metabolic etiology would be a good guess. I must warn you that an internet diagnosis is fraught with problems. Not being able to see the neuroimagining studies, and not being able to examine the child places the internet physician at a great disadvantage. Many metabolic disorders to not give classic urine and serum abnormalities of amino or organic acids. Many times these can be normal depending on the situation, such as in a non-stressed condition. Best results are when a child is sick or after an overnight fast.
Sincerely,
CCF Neuro MD
What does your pediatrician indicate? Alot of renal problem children are short, likely due to growth hormone effects and metabolism in general. However, even with illness, your daughter should not have stopped growing and gaining weight. I would check with your pediatrician about this. It also sounds like she is alittle behind in motor development. How is the fine motor control, pincher grasp, transfer, using a pencil, picking up objects that are small... It might be wise to get an opinion from a pediatric neurologist that has the opportunity to do a good physical examination.
Sincerely,
CCF Neuro MD