The main concern she has is with customs/security & limited baggage allowances, so rental in US is the absolute best solution. She has determined that an Oz prescription will be acceptable in the US.
Several members have mentioned "DME" in their responses. Could someone explain what "DME" means to a foreigner!
Based on the responses to date, buying a second machine & leaving it in Atlanta looks like the only realistic solution.
Thanks for all the responses.