The short answer is that yes, I would be somewhat concerned. However...
I homeschooled my son for K-4. In 4th grade, he had the opportunity to take the MAP in the fall and the spring. I *know* that he made huge gains in reading and math that year (because I taught him and saw it happening every day), but according to the test he lost two points in reading and gained only two points in math. His ITBS that year showed the growth, but the MAP did not, and I have no idea why (except that there is some evidence that he took a higher level MAP test in the fall than in the spring, but I don't know that for sure).
So my point is that there is a possibility that the test results aren't accurately reflecting her achievement. However, since you say you saw her regressing during the year, I would be more inclined to think that the test results are accurate.
