Guess what, I actually heard about this case sometime ago. I am as well versed as our Australian friends of course, but I remember there was some sort of public campaign to have the Australian government intervene.
One question that I have. If this women had 4 to 5 kilos of pot in her boogie board cover, I would think that one would notice the 9 lbs to 11 lb(US weight) difference.
If my bag weighed an extra kilo(2.2 lbs for our American friends)or 4 or 6 kilos one would think that a person would notice.
I am not entirely convinced of her innocence. In "other" countries, they take any drug trafficking, dealing, importing, exporting VERY, VERY seriously and I am sure a "foreigner" is going to be given a stiffer sentence to deter other also.
Moral of the story, always keep your bags with you, never, out of sight and locked.
I personally do think on the side of guilty, many people do thinks "thinking" they are so special that they won't get caught.