I have last minute doubts all the time about all sorts of things, so gifted testing was no different than anything else

The cool thing about testing isn't necessarily just finding out if your child is technically "gifted" - (imo) - it's the info that you get that shows you - as you've mentioned - what kind of learner she is, etc.
And no matter what the test results are, she is still the same interesting amazing and wonderful child you've known all of her life

No test really defines a child - there is so much more to each of us than just a few numbers!
Try not to worry about it!
polarbear