"how it seems to me is that they were out in the car when the daughter suddenly felt sick - there's no mention that she'd been ill before or even that they were on their way to hospital," That's how it sounded to me too. When I was at school there was a girl in my class who died in similar circumstances and there was never any cause found for her death. Sometimes there just isn't an explanation and no one is to blame - least of all the parents who are no doubt now living a nightmare.