My understanding of the MAP scoring system is that a score of 240 would indicate that if 11th graders were given the same leveled test your DD took, 85% of them would score a 240. It doesn't necessarily mean she's reading at an 11th grade level.
It's not quite like that, as it is adaptive, not grade-level-based. MAP test comes in three versions, PK-2, 2-5, and 6+ (which includes all the 2-5 questions and higher), so while you can't really equate a score from the grade 2-5 test to 11th grade (it doesn't have as many questions at the higher RIT levels), you can compare grade 2 to 5 pretty well, and even a loosely to grades 6-8.
A score of 240 on the 2-5 is between 98-99th percentile for a 5th grader. That means better than 98% of all 5th graders who take the 2-5 test.
You can compare students in grade 6 to grade 11 taking the 6+ test -- the scores go up each level. At the 85th percentile for grade 11, if one got a 240 on the 6+ test, that would mean they did better than 85% of students in grade 11, not that 85% of 11th graders score that high.
