Does your wife have a Medi care card BaanOz ?.... my daughter 50+ came over for a visited and travel around Asia took out insurance with AMH - (Australian Health Management) This owned by Medibank--her insurance was about $Aus300 for a year.
You must have a Medicare card to access that price, because if anything bad happens to you---then its just stabilizing and returning you to Oz.
Get a quote https://ahm.com.au/