If I were her, I'd go to Microsoft Research and try to shake loose some ideas. Until that happy day, here's some ideas I shook loose myself. Data tagging would make a spreadsheet logic checker easier.

Study Finds Spreadsheet Risk is Real; Businesses are Aware of the Risk—Yet Despite Relying on this Data to Make Key Business Decisions—the Risk is Ignored June 12, 2019 09:00 AM Eastern ...