First off, I'm going to guess that the math is actually a 237 not a 273? While they insist that MAP actually goes to 300, I haven't seen a 273 on a Math 2-5 test. Not ever, even when a kid got a perfect score- they will eventually run out of questions to answer, scoring roughly around a 260.
On that note, I would ask that the next time she takes MAP, she be given the 6+ test. This will give her the maximum number of questions and the best chance at actually getting her highest score. This is generally recommended when a 5th grader reaches the 240s, but there is no reason a 3rd grader couldn't do the same thing. It's SIMPLE so don't let them give you trouble- they literally click a different button.
NWEA uses 95th percentile to be their "gifted" range, though like Cricket said- it's not actually a test of giftedness. Regardless, those are wicked high scores and she needs differentiation.
