I suspect we're all talking at cross purposes here, and that people are talking about symptoms of hypothermia earlier because that is what fits the symptoms as far as they know. Of course it's possible that she might have been reacting at that point to either her epilepsy or lack of her epilepsy drugs but non-medical people and non-epileptic patients probably wouldn't know anything about that so people are interpreting what's been reported in terms that they know and understand.
I think it's very likely that she had some sort of crisis, whether related to her epilepsy, other mental health issues or something else entirely, but then succumbed to hypothermia on the cliffs after she ran off.
