My relative is a similar situation as OP’s mother. My relative got PR in 2010, stayed in Canada for a year, had to go back to the home country to help her mother (poor health) to care for grandpa ( very sick,hospitalized for 5 years and died),so she did not meet the residence obligation. Now she would like to come back live in Canada. If she comes back via US by car with PR landing documents and an expired PR card, could she be refused entry at Canadian borders? Or even her PR status is revoked at the Canadian borders, she would still be let in Canada and given a chance to appeal inside Canada on H&C grounds? Thanks for advices!