“A typed document was run through a pdf scanner.”
She is old enough (I am younger) to have used a Type Writer for many years in her career. If she used a typewriter for this.
One would not expect to get many errors scanning in type written papers.
If you make less than desirable copies of the type written papers and scan those in you will start to have problems with OCR recognizing the input.
As in social media, if the spelling nazi is after you, your content must be pretty damn good!