Can you elaborate on the hallmarks? Cuts on fingers? Plastic bag? I always think of drug OD and other methods for suicide and also would think she would want the carpool off her back and just tell them she'd drive herself in or take a bus. None of this seems obvious to the layperson. But it sounds like you have some insight.
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Honestly some of the methods are too ghastly to talk about even here.
1. Outdoor suicides are very common, far more common that most people think. I don't know the psychology of it. But I've seen far too many.
2. The cut fingers was probably the first unsuccessful attempt in the sequence of events. The blood smears on the seat would have been contact from exiting the car.
3. Using a bag and getting into water would have been a progression to "more certain" methods with the cut fingers not working out as quickly as hoped. I was at a suicide where a woman basically "willed" herself to death/pass out into a small depth of water (outdoors). But the combination of methods (bag, water) as I said is very common.
Many people who commit suicide display an outward shell of complete happiness prior to the event. They're able to function and get through their lives up until the point they are not. I am not suggesting she had a mental illness though it is always possible. The reasons for suicide can be complex, never found, and not understandable by those close to the subject.
People are excited about this case because it is a mystery, and she was missing. But many suicides leave equally as complex crime scenes (how did the gun get 40ft from the body?) but don't make the news because the person didn't go missing in circumstances that led to a large media interest.