If she was living and working in the foreign country it would be straight forward.
Depending on whether the amounts are in the $100s, $1,000s, $10,000s, or more per annum the best solution could be different.
Step one is to ask what options the publisher might offer for payment. Most deal with international authors so the issue should not be new to them. As for the ATO, so long as foreign income is declared and tax paid (they give credit for foreign taxes paid in most circumstances) they are ‘happy’. From experience they ‘see’ regular or large forex movements and will send a letter to ‘please explain’, at least the first time or first year until it is declared on a tax filing.
One of my ICT staff (!!) was also an internationally acclaimed author who got high 5 figures per annum in royalties from the US. He regularly commented about the IRS and ATO having their hands out. I never asked how he moved currency.