I would say the thing that you will need to look out for is how the teachers will feel about her being grade skipped. I know this may sound strange, but when our DDs have been grade skipped we have run into teachers who are against accelerations and as a result tended to see DD (either one) as just another problem and blame all issues on their younger ages, rather than on the fact that their needs were still not being met. (This is for girls 5 years apart, so we are not even talking about the same schools or the same teachers - just the same reactions to them!)
One teacher said that she didn't feel comfortable with DD in her middle school social studies class because they discuss things that are too mature. I am still not sure what she was referring to, but that was her position and she treated DD like a baby, which did not go over very well at all.
It sounds like your school is much more on top of things than our schools ahve been though. Good luck.