Not much help for you in the way of advice but I hope your daughter gets through it all ok.
My ED had to have 4 teeth extracted and they did two and two and she was so brave. The braces ached every time they tightened them but plenty of pain killers and ice cream helped. One piece of advice is to make sure your D wears the retainer for the full time. My D decided that her teeth were ok and out of vanity didn't wear it as often as she should with the obvious results of her teeth slipping back slightly.