Being naive is one thing but once again why should Australians constantly pick up stupid people whom are constantly falling over themselves. She is 27-years old so that makes her a pure adult not a child. There are mature people being married and having children before that age.
There are no indications of any mental defects with her at all so she can think for herself. There are indications that she was in a reasonable family so why didn't they pick up on little things like unlocked luggage. I'd tell you that I would have easily picked up on that because one thing, a boggie board is an easily identifiable item.
I knew about this stuff before I was 18 and I am sure that the majority of Australians would be in the same league and would have thought of that or had parents that would recheck everything.
To bring this with that she has been overseas before so there are too many cracks to be simply naive.
Being the devil's advocate - Cannabis from Australia is much stronger than cannabis from Bali people have often said. Why not make a few extra bucks to pay off the trip and that new car etc. with the extra cash where the system does not usually check pbuttengers from Australia but more from other destinations.
Most people goes to Bali for three things, party, drugs and cheap stuff so the prosecutor's offence would obviously be playing that part.
So far no one really knows if Schapelle is innocent or guilty.