
So glad that episode is over for you.
This is just terrible!! How dare that girl be so mean, and pick on someone as innocent and unassuming as your daughter??
I think you've done well by heading to the principal. Hopefully that will help. Its probably also time to have a big "talk" w/ your daughter too, even if you've already had one. If you feel like this might start to put pressure on her, she could probably use the open door to bring issues home to you. Might not be a bad idea to involve the ex-DH too. It might help to get a man's opinion on the whole sex thing... Of course, that depends on your and her relationship w/ him which I don't know about.
Its hard to offer too much specific advice since I don't know all about your DDs situation. You've mentioned the "IQ," but, honestly, I don't put much stock in those kinds of numbers. Also, you mentioned the special classes, but educational and social development are such totally diff't things. Would DD be able to carry-off that kind of "I don't care, so why should you?" attitude w/ her classmates? That tends to be the best remedy for these bratty little situations. I tend to give everyone the benefit of the doubt (its gotten me into a LOT of bad situations being so trusting though) but, I have to imagine that this little "witch" has a lot of issues of her own and is just looking for someone "weaker" (in the social hierarchy, not trying to comment on DD) to pick on and feel powerful and important. See if DD can muster a "Don't you have anything better to do?" kind of attitude. The novelty might just wear off.
I too was bullied and picked on a little here and there. (I was VERY quiet, got good grades and was an all around nerd.) I didn't make very many enemies b/c I kept to myself, but I didn't have a lot of friends either. I HATED Jr. High and didn't start finding my own level of confidence until part way thru High school. It wasn't until college that I finally realized that I didn't care what other people thought, and I was better off seeking out those who DID appreciate me than worrying about those who didn't.
Gosh, these stories make me worry so much about when my kiddies get older. That age was always so tough anyway, and w/ as advanced as kids are now, it just seems to be worse and worse. And, instead of just hurt feelings, you have to worry about physical stuff too. I have a feeling I'm going to have a lot of "grant me the serenity" and "give me strength" kind of days!

for DD, and I hope that the "witch" finds something better to do w/ her time than pick on some innocent little thing.
Sorry to hear you were picked on too! (see above about some of my stuff). I used to have one girl that would constantly steal my lunch money out of my desk and pick on me in the hall. I got so upset for a while, then I finally confronted her, and then proceeded to ignore everything she said... good or bad. It got worse for a while b/c it drove her crazy, but she eventually gave up. That taught me a lot. That, when it comes to bullies, its usually much more about how they are feeling than about how they feel about you. "What doesn't kill me...", right?
What great advice. You are definitely a wise woman.
Has she tried Birkenstocks? I kind of scoffed at their claims for a while, but we have slate tile floors, and I have back trouble. My mom got me a pair, and I started wearing them as slippers. They really break in nicely and offer support in all the right places. (The soles are made to mold to your feet, so they give each person what they need.) They do take a breaking in period though, so if you try them, be careful to wear them at home in small doses before trying a big walking vacation like Disney. Plus, since their sandals, they let your feet breathe... my feet have been swelling from the pregnancy, and I really look forward to putting them on at the end of the day now. (Can't wear open toes and work, so I have to keep my sneaks or workboots on there.)