I know this has been mentioned much further upthread, but as it may be relevant to what's being discussed again, I'll re-post:
<bbm>
SB:
"At the same time I had several major stressors and through the next 15 months I made a slow transition into a complete mental break down. I am doing much better now, but because of the life style changes I have had to make to get myself here I am not as active and have started putting the weight back on.
I liked my weight the past year. I always felt beautiful, even though I was misserable, and I want to bring myself back to it, but I am worried that it may have been a major factor towards my mental health issues."
Take what you will from that, but it seems clear to me that her mental health should not be ruled out as a factor in her disappearance.