She even told me she wouldn't recommend it, as DD would need to be skipped several grades, and advocating for a one year skip is difficult enough at the school.
That's one of those mental errors we've been talking about lately - turns out that for most folks, the first skip is the hardest. After the first one, then the subject accelerations are easier to get, and then it becomes pretty obvious a second or third would be even better. YMMV, but this is the most common pattern I've seen.
Excellent that you've got a friend, especially one who gets your kid, especially one who has resources! Ask her to borrow some middle school science books for you to look at. You'll be floored, I would bet. When I opened DS's I thought - Oh! This is exactly what I was looking for when he was 6!
Smiles,
Grinity