moomin - is this in any way related to the introduction of the glasses? Did it start after the glasses, or worsen after the glasses were added? could she still be working out how to function in a seemingly different world?

But really my first response was - she's smarter than her teachers and knows it and is working them...

I had to re-read your post a few times with regard to the teacher and neuropsych saying that it would be detrimental to remove her from the class, I was thinking "Huh? THEY are the ones doing the removing!" then realised you are considering not sending her to this preschool/class at all and they think THAT would be detrimental? I can't see how, if they think rewarding her bad behaviour with exactly what she wants, that these teachers can possibly know what is best for your child?