I would say this is a bit generous, but in the ballpark. In the boy's race a 163 SR was 16 flat. There were 32 boys who ran sub 15. I would be curious out of the top 20 in each race how many ran their best times and by what margin.
I won't question the speed rating as being either high or low. But when you think about it, this course is basically a track where you can just get into one stride and maintain it, never having to change to go up or down hills, with no soft surfaces to sap strength, and with the added benefit of being able to run tangents.
I congratulate her on the achievement in any case.