Thank you all so much for your responses. I feel much better just having a chance to talk about this. I went into my meeting based on the injustice of having her be the only child to be restested. The CST agreed and stated that they predicted her scores would probably only increase so retesting is not necessary. I am not sure what the principals final decision will be but I provided a lot of research that stated age 6 is a valid age for testing a G&T child.
One thing I have learned from this process is that I need to continue to be an advocate for my DD and keep pushing the school to provide her with the services she deserves. Thanks again!