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A lonely British man who flew across the world to propose to a woman he met on the internet has been stabbed to death by her jealous boyfriend - just two days after he arrived in the Philippines.
John Lorne Mc Donald, from Aberdeen, fell for Filipina who had placed details about herself on an internet dating site - but police suspect she failed to tell him she already had a boyfriend.
That is the most applicable visa in your situation.
EDIT: The main issue that the Department of Immigration will be concerned about isn't how she'll support herself in Australia, but whether she'll overstay her visa.
All you can do is try to submit the strongest evidence you can to demonstrate she'll return home. I'm no expert on this stuff but I would have thought a letter from her school confirming she is enrolled and has a course to go back to might help.