Is it too catty to suggest that she say something like "Wow, you must be really insecure to feel the need to rub one missed problem in my face. Or are you just a bully? Regardless, I'm happy with my score, thanks!"

I guess what I'm saying is that sometimes stating the underlying truth helps cut a bully off at the knees. And this IS bullying! Academic bullying is still bullying!

I'd definitely be talking to the teacher about it. And I'd use the word "bullying" quite prominently in my conversation!

Kriston