My mother's PR card expired on May 08. She's been living out of the country for the past 2 years. She would like to return to Canada now and needs to apply for temporary travel document. How can she prove her required 730 days of physical presence in Canada? Would the Notice of Assessment from Revenue Canada be sufficient? Also there are no exit stamps on her passport when she left Canada. How would the Immigration track this information? Please advise. Thanks.