I honestly don't see how it is possible for Tink to be right over your head while standing directly in front of IASW. She takes off from the side of the Matterhorn, and flies over the Castle and lands in a spot between Fantasyland and Thunder Mountain BBQ area. Anyone who knows the layout of DL knows that IASW is not on Tink's flight path.
I've viewed the fireworks from in front of IASW, and Tinkerbell was directly behind us, and we could only see her if we craned our necks.
However, I have seen Tink fly directly over me when I was watching from the Storybook Canal boats, which if you are lucky enough to be in one at the time the fireworks are set off, you stop mid-canal and watch the whole show. Now THAT was magical!