The medical examiner is required by law to do a full investigation on any death that is unexpected, violent, or unnatural and show evidence to back up finding. JMO and previous experience, but short of a suicide note it would seem hard to prove suicide in this case especially with the tire tracks they believe to be hers (linked previously). That said, we don't know the facts on what has been found. Can't speak for Florida but the medical examiners in my state are very cautious about listing death as suicide unless it's black and white. This is partially in deference to the family as well as the legal implications concerning insurance , law suits etc..