Problem: A 28 year old female with history of seizure disorder on antiepileptic therapy and recent pregnancy presents with several day history of progressing acute encephalopathy, jaundice, nausea, emesis, fatigue, and generalized abdominal pain. Abdominal US reveals no evidence of cirrhosis but a fatty liver. Urine drug screen was negative. Lab data demonstrates severe transaminitis, hyperbilirubinemia, hyperammonia, and coagulopathy. Given her history and presentation, you are most concerned that he diagnosis is: