Sasha Rodriguez's death was ruled an accident. She died of complications from the drug, according to Ed Winter, spokesman for the coroner's office.
Rodriguez was taken to the California Hospital Medical Center in a coma and was pronounced dead days later on June 29.
More than 100 people were hospitalized during the Electric Daisy Carnival event, many for drug intoxication symptoms.
The event was held at the Los Angeles Coliseum June 25-26.