In our personal experience, even with a child who scored much lower on speed related tests on the WISC-IV, the SB-V score was still much lower overall than the WISC. I have also heard, as the pp alluded to, that the SB-V is generally scoring lower for many kids especially older kids. The SB-V is also supposed to score more highly for kids whose strength lie in the mathematical areas. Your dd seems to favor verbal areas.
If she needs higher and/or more recent IQ scores, I'd be inclined to go with the WISC-IV again with a tester who has experience with gifted kids.
Also in our experience, a lot of districts are more concerned about high achievement scores than high IQ scores. Our state, too has varying qualifications for GT programs from district to district. My one dd with the erratic scores on different IQ tests does have a WISC-IV GAI well above the 99th percentile but does not have a GT identification currently in her school b/c her group achievement scores aren't consistently that high.
I'd take a look at what the possible requirements for GT identification are in the various districts b/c she might get in just with the achievement scores you have.
