Well if she was diabetic as her mom says then coupling that with anorexia you could see why she died so young. I have a friend who is diabetic and she has had three heart attacks, she is just 34, the doctor keeps telling her to stop crash dieting because it is essentially killing her.
It almost sounds like she had a seizure with the whole vomit thing. Diabetes can cause seizures. Seizures can cause heart problems.