Put together by other people who work for her. All she likely has to do is glance at it for a second and move on. She might have seen those spreadsheets, but she doesn't have to know that it's 'Microsoft Excel' nor how they function. And when you're at the level she is (or was) at, I'd even argue that you have less exposure than a glance when it comes to that stuff - your team will brief you and not necessarily bother showing it to you.
>Also, does not knowing about Excel also imply that she's never heard of Microsoft Word? That seems too farfetched.
This is where HN often falters - assuming average Joes/Janes or people not in tech know more about tech than they actually do. I'd wager that you'd be surprised at the number of people who don't know what Microsoft Word/Excel are.