I understand you want an answer immediately. However, it takes time to prepare responses. And when you post a response, it puts your question at the bottom of my list, causing you further delays. Your patience is very much appreciated.
ANSWER: The best thing to do is to respond with the same documents and provide a calculation of the expected income-at the current rate-for as long as she intends to remain working in Australia. Then she should provide some sort of evidence of assets that she has in the US, and if possible, a job letter including her salary. As far as the documents they request, she simply responds by explaining what you have - that those documents were not provided by her foreign employer.
Sometimes, they just need to have it explained to them in the simplest way possible.
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