Maybe your daughter was simply hiding her abilities during the screening. I could easily see this happening with my DS4, who sometimes lapses into a weird form of baby talk when he's nervous or uncomfortable. He's also a perfectionist who will downplay his abilities to anyone asking. Just last weekend a friend asked him if he could read, and he said, "Just little words," which is ridiculous, as he reads and comprehends books written for kids age 8 to 12. The private school I am sending him to in the fall will spend the first two weeks of the term assessing all kids in each core subject area, and I can't wait to see how closely the assessment results match what I know about DS's abilities. I don't expect it to tell me much about my son, but I expect it to tell me volumes about the school.
