My first advice would be to look up any district and/or state guidelines for whole-grade acceleration. And then I'd caution you on that, because the policy we found in our case did not match up with practice.
One way to probe the school's intent and the existence of a process is to send a friendly email to the principal (or other official leading the meetings) to ask if they could provide you with a quick overview of the process, and ask where your DD's case currently stands in it. Their response should be telling.
As for BTDT... we found ourselves banging our heads against a wall, to put it simply. No member of the school or district would ever favor a grade acceleration, and therefore, nothing productive could come from anything DW and I could do. The school mismatch was causing my DD significant psychological problems (perfectionism, self-harm, explosive anger, social isolation, etc), so we ended up yanking her out and homeschooling twice, then returning her to public school when she was eligible for something better.
The first time, we pulled her from K and returned her the following year as a first-grader, when full GT was available. The second time, we yanked her out of second (DD managed to make it through first), registered her with our state as a third grade homeschool student, gave her the 3rd grade state achievement test at the end of the year, and presented her to the school the following year with a take-her-or-leave-her proposition... she's in fourth, or she's done with you.
So, from a school support perspective, this was a worst-case scenario, but we were able to make it work anyway, because homeschooling was an option.
