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Her school has been disinclined to believe the higher tests scores calling them a result of good guessing.

I believe the ability to guess good is a factor of intelligence!
As for the RIAS our school district has recently switched over to this test and has actually been seeing more students test into the gifted program. And they are happy because they get more $ from the state for GT.

The only part on the RIAS where guessing can help you is on one section of the visual spacial. You are given a # patterens/shapes and have to point out which one you think is different. you do not need to why it is different.
The verbal section is NOT multiple choice, so you either know it or you don't. My DD scored VERY high in the verbal and I called the psy to make sure the results were valid and that she was not a good guesser..Denial

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The psych who will be testing her is going to readminister the WISC

Is this psych a school councelor? If not I suggest you check with your school to see which test they would honor before making your final decision.
Are you applying to get into a gifted school or to get into the gifted program at a regular school?
We wish you luck!!!