If you can afford testing, it might gain you entrance into DYS. You will probably have to pay a few hundred dollars for an IQ test; you don't mention anything that would suggest that her school would pay for testing. If she doesn't test at DYS levels, you will still get some information about her strengths that you may use in the future. On the other hand, a few hundred dollars could probably pay for a lot of enrichment.
Her CoGAT testing does imply a fairly high IQ, but the only way to know that for sure is to take an IQ test.
Good luck with your decision.
