The diagnosis doesn't make any difference. As a friend of mine with AS once told me, "I think my parents did the right thing with me, because they always saw me first as Judy, and then as the diagnosis, and if I were to say anything to the rest of the world about handling kids, I'd say relate to the kid, not to the diagnosis."
She still is your baby girl. You've just got a longer road to walk. She might be just average in a few years, but she might also be brilliant. And so along with all the other stuff, watch for that, and be ready to respond....whatever it takes.....music lessons, math clubs, whatever else really smart kids do. I've been AS all my life, and it never got in my way.
And by the way, if you're a member of WP, you're already a member of one of the biggest support groups in the world. Join a town-based support group if you want, but don't do anything special. "Listen to your daughter, go to school and fish her out of messes she's likely to get into, and keep doing it." And while you're at it, look after your own sanity. An AS kid can be exhausting and crazy making. But As is not a disease....especially if she's HFA. You might be raising one of the great writers of her generation. You're just going to have to wait to find out.
And one other thing, which I'm sure a lot of the people on this board will tell you.....when she's blamed for things, and made fun of (if that happens....and I'm sorry to say, it does) be there to be her support. Believe her over school officials, even when that's hard to do. Autism or not, you'll wind up raising a self-reliant compassionate young woman. Maybe she'll just be average (and she's entitled to that, we all are) but then again, you might be in for the "ride of your life."
Good luck.
Beentheredonethat