From her friend's post (above), it sounds as if she may have been very high on edibles. If that were the case, she could have parked her car wonkily, wandered off, taken off her shoes, etc. Whether they were homemade edibles or not, there's no way to standardize what you're getting in an edible, or how it will affect you (given all the strains out there now). It's possible she got herself into the woods somewhere and lay down for a nap, and died of exposure. I don't know if that could happen in the span of 5-6 hours, but her friend's post also mentioned a bleeding ulcer.