Why are you asking about 2e? Was there something in the previous testing that suggested something? If you have WIAT and WISC testing, that's a more accurate picture than the fluctuation on the one test.

Reading does start to shift gears in third, more towards thinking about what you're reading beyond comprehension of who-what-why-when-where. Is she in a reading rut at home? We've had leaps at home simply by putting fairies or talking cats aside for a few weeks in favor of a different genre.