By 99 percent, do you mean 99th percentile? What grade level is that? Maybe that other test demonstrates that she is already above a 5th grade level? In other words, maybe she already scored what she needs to.
Usually kids at 99th percentile are two or more grade levels ahead.
I guess whether to trust her depends on how hard it is to mess the test up. If she is just giving it to her, your DD does it on her own, and then it gets scored, it's probably fine to have her do it. I would have a harder time trusting incompetent people to do tests like individually administered IQ tests. That's why we had it done privately.
