The patient presented with fever, progressive pallor, weakness, nosebleeds, enlarged liver, prolonged blood clotting time, and increased liver enzymes. Her condition deteriorated despite treatment and she developed urinary incontinence, low blood pressure, fixed and dilated pupils, and went into cardiac arrest. Liver biopsy surprisingly found no evidence of infection but showed fatty changes. This led to the diagnosis of Reye's syndrome, a rare condition causing liver and brain damage from mitochondrial dysfunction following a viral infection.