Good luck with your meeting, Ellipses. I hope you're able to get a better fit for your DD.
I wonder if it's possible for you to suggest some differentiation ideas to the school? I've posted elsewhere about the in-class differentiation program they're trying out at my DC's school. They're using Susan Winebrenner's How to Teach Gifted Kids in the Regular Classroom. It's mostly open-ended higher-level-thinking types of exercises, which give the kids some room to explore things at their own level. It hasn't been the perfect educational experience with it, but it's been worlds better than last year without it. Not sure if something like this would be helpful for your DD, or maybe you have an idea of what you think the differentiation should look like that you can share with the school.
I know that the school should be taking the lead on this, but if they're not, and you're able to provide some concrete resources to help them in the right direction, I wonder if it might get you what you're looking for.
Sending good thoughts your way for today's meeting!