The COGAT score is part of her educational record-- you are entitled to it.
Some gifted kids get a good measure on COGAT, but some do not.
Depending on whether the score seems about in the right ballpark to you based on what else you know about your child, you could ask your tester about whether some other test would be useful or revealing in your case.
Whether anything further is worthwhile also depends on what you're trying to achieve through testing-- achievement testing is useful in getting school to see the need for differentiated instruction or acceleration.
