That is the presumption. Now, it's possible that her future math achievement scores will slip slightly, both because the expectations are so low for this age, and because of regression to the mean, but I would think they would continue to be quite high, especially since she scored equally well on calculations and reasoning, suggesting that it's not merely a fluke of low expectations.
And of the five WISC-V primary factors, FRI would be the best predictor of math achievement (followed, most likely, by WMI).
