Waggaboy

Hi, I need help with what type of visa to reapply for. I am an Australian citizen who has been married to my Canadian wife for over 30 years. When we first got married we lived in Australia for 7 years and my wife had her PR visa. We then decide to move to Canda as my wife wanted help in raising our kids who all have dual citizenship as well as me. which where we have resided for the last 25 years. We have decided to return to Australia as we and especially me have had enough of the frigid cold. I would like some advice as to what Visa my wife needs to reapply for? Any help would be much appreciated. Thanks