If your school doesn't have a GATE Coordinator, I'd contact the district coordinator for fact finding. Odds are slim that someone at the school has encountered more than one kid at your daughter's level; whereas the coordinator should have wider exposure and hopefully training in the topic and be able to tell you the options both in your school and outside of it; that's a key piece of their job.
When needed, I find people get it a bit better when I translate the scores to ratios... in this case you could say (based on GAI) that fewer than 1 in 10,000 kids score in that range, or for the FSIQ, fewer than 1 in 1,000.
