Stacey's death was a tragedy; that is for sure. Until and unless some new information comes forth (next week, next month/year or 5 years from now) this will remain the official finding.
In reading the comments from the medical examiner's office, I am struck by the notion that they do not have "factual evidence" of how her death came to be (as evidenced by the use of the word "likely"). Seems to me that they had to come to this conclusion (or have a finding of "inconclusive") - because they also did not have "factual evidence" of an abduction, struggle, murder, suicide or any other evidence of foul play. From the investigation/evidence they collected, there was a process of elimination of causes. Finding none, they made a judgement call based on factors present.
While there is the possibility that she was experiencing a "break" and got herself to Lakewood in her car, got out and walked almost a mile to some woods, crawled under a tree trunk, hunkered down and died - to me that scenario will always seem remote - but is it possible? I guess it could have.
My gut feeling, at 60 years old, is that there was more to it than this. One disappointment is that LE has now closed the case and reportedly will have nothing more to say about it or answer any questions.