Your daughter is clearly doing very well with her academic skills! 99th %ile is excellent, no matter how you slice it.
I would caution, though, that it is doubtful that the norm group is deep enough to interpret at the +4 SD level, especially on a test where only somewhere between 20 and 50ish items are administered, even if it is an adaptive test.
If you want a more accurate assessment of her cognition and academic skills, you might want to investigate comprehensive assessment through a qualified examiner, with a reliable individually-administered cognitive instrument, such as the WPPSI-IV, SBV, or DAS-II, and achievement instrument, such as the KTEA-3, WJIV, or WIAT-III. Just make sure whatever you have done won't interfere with the validity of the future GATE testing (2 year minimum time to re-test on cognitive ability tests).
