hello thanx for posting ur query, ur daughter is most likely suffering from of acute Gastroenteritisas supported by the lab result o but developed some complication which i will discussed with you later in my post . Well Gastroenteritis can be due to virus,bacteria/food poisoning. This usually results in your stomach and intestines becoming inflamed and causing discomfort. but sometimes when it is over whelmed it can turned into some complication but with proper assesment and treatment patients got the full recovery. your daugther hospitalized and getting proper fliuid is a very good desicion done by you as this is the main stay of treatment i.e good proper fluids and also need some antibiotic in order to get rid of the infection if present any. the main concerned which i have is chest pain , extra sleeping . . as might b ur daughter is having some Electrolyte imbalance like Hyponatermia , Hypokalemia, Hyperglycemia( diabetes mellitus 1 may present in diabetic ketoacidosis), haemoconcentration due 2 hypovolemia or extra free water losses. As all these situation may lead to the drowsiness and vague pains , so i advised you to URGENT go for SERUM ELECTROLYTE and BLOOD SUGAR level and BLOOD CP and ECG and discuss your doctor with all possiblities as might be she is having one of the unerlying feature. meanwhile give proper hydration and electrolyte replacement in forms of intravenous drip and he might need good antibiotic according to the clinical and lab aseesment and and keep an eye over serm electrolyte , sugar level , urine output as these are the uter most important. if these are ok in a normal range than your daughter will soon get the recovery in a week. hope thats gona b helpful for you. wish ur daughter health. regards take care