A 19-year-old female with past medical history of type I dia…

A 19-year-old female with past medical history of type I diabetes mellitus and seizures on oxcarbazepine is admitted for fever, chills, and myalgia. She works as a nurse assistant in the local skilled nursing facility where a few patients recently have been diagnosed with the flu. Her appetite has been poor since her symptoms started, and she also reports bouts of diarrhea. On physical examination, she is febrile with a temperature of 38.7°C, blood pressure is 102/76 mm Hg, pulse rate is 120 beats/min, and respiratory rate is 12 breaths/min. Laboratory values show the following: Sodium 130 mEq/L (mmol/L) Potassium 4.1 mEq/L (mmol/L) Chloride 95 (mmol/L) Bicarbonate 9 (mmol/L) BUN 9 mg/dL Creatinine 0.7 mg/dL Glucose 623 mg/dL What is the MOST likely underlying cause for her hyponatremia?