First off, WD was misspelling things as a joke.
She's a smart lady and doesn't need your corrections.
Which brings me to my second point: no one does.
Look, you and I are in the same boat. We both spell words well and can put together sentences well, and errors in either of the aforementioned areas are extremely displeasing to us.
But the thing that people don't realize is corrections of spelling and vocabulary are equally if not more annoying than the errors themselves. I know you're trying to make things better, but in reality it just gets on everyone's nerves. That's why I gave up on it years ago.