Vulgar
That's a possibility. She did come to the island with that escort- perhaps, in the beginning, he was a candidate.
Maybe my memory needs to be jarred, but why was Kate in Australia in the first place? I understand she was running from the marshall, but why did she go to Australia of all places?
Because she killed her father and she told her mother about it, however, she betrayed Kate so marshal was called and began chasing her, I can't remember how did marshal knew Kate went to Australia... Otherwise, I was wrong.