I guess my biggest worry is that if she finds the testing boring that she will not do well.
Yup. The same thing happened to me when I was in grade one. I was pulled aside and tested for eligibility to skip a grade, and I (still, 39 years later, lol) remember thinking the material was beneath me, so I didn't cooperate. They left me with my age peers.
It didn't work well for me, and by grade seven I was so bored I was angry and defiant. In high school I had no study skills because I had never been challenged. I never did homework because I literally didn't know how to motivate or discipline myself. I earned only a small scholarship and failed to make the honor roll at the end of grade twelve. I never ended up going to university (although I was accepted) because at that point I had lost interest in all things education-related. sigh.
I agree with knute974 - discuss the boredom issue with the tester. You could also talk to your daughter about it as well (no one prepped me) about how it's important to do her best work even if she thinks it's boring.
Meanwhile, you could collect a portfolio of her achievements (video tape her as well) in case her testing doesn't go well... at least you'll have other tangible evidence.
Good luck
