Nephrocalcinosis is a disease of kidney tubules that causes calcium to deposit in the tubules of the kidney. This disease is commonly a congenital disease (she was born with this abnormality) but can also be caused by such things as primary hyperparathyroidism, renal tubular acidosis and medullary sponge kidney. It can associated with kidney stones and may also cause abnormal blood chemistries. Your daughter should be evaluated by a nephrologist and undergo testing to see what medication should be given to her. This testing should include a 24 hour urine collection. Treatment requires a specific diagnosis. Hence, your daughter needs to have a specific diagnosis before specific treatment is possible.