We decided to do IQ testing for similar reasons. We thought from an early age DD might be gifted, but never felt the need to test her. Then she started developing anxiety, panic attacks, a fear of failure, etc...quite a few attributes that often show up in gifted kids.
Ultimately, it helped fill in the whole picture, and has helped in advocating at her school for proper differentiation. Not sure if it is connected to the proper differentiation or a change in school setting, but I have also noticed a drastic reduction in her anxiety in the last year.
Funnily, DD had the hardest time at a Montessori school. Her teachers were absolutely amazing, but it turns out her Visual-Spatial IQ is 3 SD lower than almost everything else (VS is 106, PS and memory are 145 & 147, for example). All the hands-on materials, especially the math stuff, were highly frustrating for her. Despite my LOVE for Montessori, we ultimately pulled her from the Montessori program, and she is thriving in a different school setting.
