Our public school has the same 90% requirement to skip a grade. About a week after my son turned six, he took his school's test to see if he could skip first grade. I overheard some of the questions on the test and there was something on it that was not even taught at our school until third grade--I asked my son's public schooled friends about it. At that time he was reading well at a 5th grade level. He loved BrainQuest cards and was doing the 3rd grade level at the time he was tested because he had already gone through the lower level cards. I was not allowed to see the test my son took but I was told my son made what would have normally been a passing score had he gone through first grade, but not 90%. I called our Dept. of Education's gifted ed department and was told they didn't have any control over the tests that were used to determine if a child could skip a grade. I also told the state's gifted ed. department about the tester's recommendation that we homeschool and that the principal and a first grade teacher had also recommended it. She told me she agreed with the homeschooling recommendation and that "my child was worth it." I also wanted more choices. I was very shy and I wanted my son to have lots of friends at school. I loved helping out at the school. I liked being around the teachers and I had made a few friends there. It felt like I was being kicked out of school too and we had done nothing wrong. My son just wanted to learn. He called the school the rudimentary elementary because all they wanted to let him learn was rudimentary skills like coloring in the lines, which he had difficulty with because of a mild disability.
So I had no choice but to homeschool. I thought I would give it a try for one year, but after that year he was even further ahead academically and he still wouldn't color in the lines and they made the kids do a lot of coloring at his school. So here we are six years later, still wishing I had choices, but realizing that we are very lucky that we are able to homeschool. Maybe you could try joining a homeschool group? Maybe you could find a homeschool family that your daughter could stay with when you work?
