I'm going to go out on a limb and guess (based on a quick perusal of the intervention by design website) that the test is designed to find kids who are having trouble, not to find out where high achieving/gifted kids are. I have the same issue with with the DIBELS testing they give my son. It's designed to find kids who having reading problems, not give any sort of accurate measure of reading level, especially when they are at the high end. I wouldn't really take the score from that test into account for your daughter.
