{{Empathetic Banging My Head Against the Wall}} I've got a similar situation going on and I'm just continuously flabbergasted that schools don't truly want all kids to learn as much as they are ready for. Aargh!
It sounds like you've had numerous talks and negotiations over the past couple of years. Any chance there are other school options out there? Any chance you could politely threaten to pull your good-for-their-standardized-scores daughter out of their school if they continue not to teach her appropriately? Have you pulled the "What a (MY) Gifted Child Doesn't Learn" card?
