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This should be followed up with Qantas Frequent Flyer - by email would be ok. I'd advise your wife to keep the receipt from the cafe (or extract from bank statement) and attach it to the email asking for reimbursement.
I assume she had the QF FF number in the booking/ on the boarding pass ? Not another FF program? That’s been reported - trying to get in with QF gold but crediting to another program. It sounds odd that she wouldn’t get access as anyone working at a QF international lounge should know who the oneworld members are.
If on a QF flight number - irrespective of operating carrier - she should have had access anyway.