Just to head this off; I understand cheating concerns may prevent the tests from being copied, but the homework assignments should provide a suitable base for a tutor to see where she would need help, and areas to strengthen before the test. Even more importantly they will see areas that she is exceling in, and would be able to structure their tutoring in a way to focus on her weaknesses in a particular subject using her strenghts as a way to get around her weakness.
ie she is good at music, so use neumonic devices to help her learn european history, or for fractions say something like if you have two musical pieces you want to combine, but one is in 3/4 time, and the other is in 7/8 time you can't just add them together because obviously they are not the same, so you need to make them both in some time measure that works.
Something like that, I don't know, I do know it's tough, I worked with kids with autism for a year, and with them it was even more important to find a method of presenting something in a way that they will attend to the task, as well as gain something out of it, not even close to simple.