She needs to get a new/renewed Thai Passport
Perhaps see if she can get one now from the Thai Embassy in Canberra (which has consular jurisdiction over Queensland)
Otherwise, just use her Australian Passport to get into Thailand in order to sort out:
1.) be currently listed in a Blue Thai Household Book (Blue Tabien Baan)
2.) from the Blue Tabien Baan, get a new/current Thai ID Card
3.) with a current Thai ID Card, then get new Thai Passport
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