I'd suggest to your sister that she write a (polite) letter detailing what went on (the situation, the calls, the e-mails, the lack of response) to the MP who let her down, letting him know how he let her down, and how someone who wasn't her elected representative stepped in and helped her. Also send copies to the riding's Liberal Party association, and maybe even the federal Liberal party. Also have her bring up this issue with her MP whenever he or his representatives come around campaigning. Aloha, Brad