Thanks for your query.Based on the facts that you have posted it appears that your daughter has tachycardia
with ketone bodies
detected in her urine.
The reasons presence of ketone bodies in urine has to be searched for .Since she drinks enough quantity of fluids orally, dehydration
as a cause of ketone in urine can not thought for.
Please get her blood sugar levels on fasting and post lunch done to rule out juvenile Diabetes