Knowing that, and the Weightings of 50 / 30 / 20 - I will be able to determine how she did in the 3 Sections.
No you won't - the standardised scores don't have a direct linear relationship to the raw scores - they are measures of performance relative to the average. To give an extreme example if the average raw score was 10/80 then a raw score of 10 would be a standardised score of 100, just as if the average was 70/80 then a raw score of 70 would be a standardised score of 100.
What you can do is undo the weightings - double the verbal score, multiply to numerical score by 10/3 and multiply to nonverbal score by 5. Any of those over 100 mean that they did better than average in that section, any below that they did less well than average. For scores between about 70 and 130 you can estimate a percentile (i.e. what approximate percentage of candidates scored less on that element) by subtracting 50 from the score.