Welcome! You don't want more decimal points than 99.9; the numbers aren't meaningful enough for that to be sane. I'm not a statistician either, but on the basis of this test your daughter is very very bright. The Wikipedia article on
standard deviation looks OK and you might or might not be content with looking at the pictures :-) - your DD is over in that thin 3sigma tail of the top diagram, doing better on the test than 999 of an average 1000 children her age taking the test (or you might find it easier to think of her being somewhere in the top 1000 of a million children taking it). She's bright enough, in other words, that to put it crudely, how bright she is is probably never going to be the limiting factor on what she can achieve. However, the dyslexia might be, and there may also be interesting information in the details of the marking of the test she took.
If you have the details, there are people here who could comment, assuming it's a well-known test like the WISCIV. One thing to look at is how different her GAI (general ability index?) is from her FSIQ (full scale IQ) - are either or both of her working memory index (WMI) score or her processing speed index (PSI) score much lower than her others (PRI, VCI, unless I've forgotten a TLA)? They almost certainly will be somewhat lower (they almost always seem to be in gifted children), but if either is below the 50th percentile that's definitely worth being aware of, and if they're up to around (plucks a number from the air) the 65th maybe, you might want to think about it. These don't get counted in GAI, but they can be important in school achievement and more generally. There are ways to help, if either is a severe relative weakness.
I will say, Ruf's "levels of giftedness" mentioned above are controversial because they aren't based on good data, and I have the impression that parents of 2e children often find them particularly unhelpful.
