It's been a long time since I've been 13, but if she likes thrill rides she should definitely know how to use fast pass. Since it's been 9 years, she should check out a web site or book so she will know what kinds of things Disney has added and what she wants to do in advance. Then she won't have regrets about something she missed out on.
Also, when I was a teen I used to bring a hat with me so I didn't have to spend so much time on my hair.