Help

My mom was purchasing a home and the mortgage company paid the amount on one of the notices they billed her. However is was not her who went to the hospital and those charged fell on her how do i go about getting that money back. They requested photo id and social security card and a copy of the check front and back. This happened in 2008 and Im not sure how to get the check copy . I wanna put up a fight and not let them tarnish her good name.