without being told the chemistry of what was being taken/drunk at this party, i for one aren't sure as to what was going on with her?
for example, NO ONE AT PARTY has been on record saying what was going on, and i would venture to guess that cocaine was part of the mix. thats just a hunch. if so, she wouldnt be so groggy or out of it, until she came down, and then if alcohol was still playing a part in her body chemistry, she could very well of finally 'crashed' as in, passed out.
and, that the car and her bedroom were investigated fully by police, there is no evidence released saying anything to the fact of her possibly experiencing alcohol poisoning. BUT PERHAPS thats why she changed clothing? why else, would she? many reasons, one of which is that her outfit was damaged or dirty. from the accident, perhaps, as well.
thats why, i was thinking the k9/scent is so vital that first 24-48hrs, BECAUSE her trail could be followed (and allow the mind to wander a bit,) and think of the possible things she could of left/done in this area to figure out where she dissapeared to. sometime in this time frame, with her being everywhere in this area, AND IF SHE WAS AS INTOXICATED as we assume, i think its not out of the question that IF a trail existed as to her whereabouts, something could of been followed physically via scent. im no ranger/expert but thats why i keep wishing that within that first day or so, all the stops woulda been put out there to find her.
all imo, and overthinking this is making my head hurt. perhaps its much much more simple, as to what happened