We do know for sure what her potassium levels were when she was admitted to the hospital. We do know for sure, according to the Merck manual, that people with her level of potassium, are twice as likely to have cardiac arrest. Which is what the attending physicians who admitted her said she had.
3.7 potassium level make you 2x more likely to have cardiac arrest (which is not a heart attack) hers was a 2.0.
We do know for sure, based on her parents and friends testimony, that she drank 10-15 glasses of ice tea a day. That level of caffeine will severely deplete the potassium levels.
And the cause of her low K was what? Emergent care? Overdose of iced tea? Ingestion of caffeine straight up? You don't know, the ME says it is inconclusive but that's not gonna deter you from making unfounded assertions one bit, is it?