Can a former employee demand access to her personnel file?

Q. A former employee called HR asking to review her personnel file. We already let her review her file following termination last year, and nothing has changed in the personnel file since she reviewed it. Can we just tell the former employee “No”? Or can we ask her to pay for a copy of the file for her own records? Our HR manager is going on vacation next week. Can we wait to deal with the former employee’s request until after the human resources manager gets back from vacation?