This is one of those areas I have the cognitive dissonance. The "right" answer is to tell the kids to check their own work. Pretend like they're Mrs. T and correct anything she would have marked as wrong. Really I feel like saying, "How can you say that teaching a child above grade level is not letting them be kids, but expecting them to perform like a computer program is?" They say there's more to school than just academics, like learning to do what your boss says. How are they not too young for that? The worst part is that your nine year old probably takes it very personally that the the teacher doesn't like her. You've got much better advice in this thread. I'm just sympathizing.

Youth lives by personality, age lives by calculation. -- Aristotle on a calendar