ps - one other thing I'd add - how unusual do you think your dd's ability is at her school? Is she completely exceptional or are there a lot of other bright kids? If there are a few other peers (ability) another approach to consider is offering to volunteer to work with a small group of high achieving / high ability students yourself on a regular basis in one subject area such as math or writing etc. We have had parents do that with some minor success at my children's elementary school. In our school it worked best starting at the classroom level with a willing teacher rather than having a parent approach the principal first.
I did this with my dd13 when she was in 4th grade and would have some feedback if you wind up going this route. First, like polarbear mentions, make sure that she won't be way beyond the highest group. We found that it was less successful when our child needed more than most or all of the other kids in her class. Secondly, make sure that the material they are giving you to work on with the kids is related to the curriculum she'd be learning at school but more advanced such that it leads to higher achievement test scores which tends to be what she'll need to show consistently in order to be offered more acceleration later. My dd's pull out math, while fun, consisted of me doing things like suduko puzzles with the kids which created very little, if any, gains in math achievement scores and made it less likely that she was going to be offered acceleration the following year b/c she had learned very little that year in math and her achievement scores had, accordingly, pretty much stagnated.
