Uh-huh. Thats my point, you see her saying ‘American’ as a pejorative and snotty dislike of the US. When in fact she simply meant she didnt want an American to direct (and possibly ruin) her very British story. Its your interpretation she is anti-American. Its mine that you are reading far too much into ‘American’. You are reading it literally.
So what if she added foreign characters FOUR books down the line. Authors change their plans as they write.
Why arent you btw raging at Kurt Russell?. Who publicly stated that Scotsman Gerard Butler shouldnt play Snake Plissken in a remake of Escape from New York, because he is not American. Isnt he being xenophobic, bigoted and anti-Scottish/British/European?. Or is it OK when Americans do it?.
Further she made those comments about Foreigners in the books saying the books were about British Children and then later introduces foreign students into the books yet no Americans. If she didn't want them in the books fine but her reason was it was about foreigners not being British Students. Well last I checked France nor Bulgaria are or were part of the British Commonwealth so apparently her reason for not including Americans in the book were because they weren't British were a "selective choice" at best.
And Snake Plissken with a British Accent won't cut it!