I am a junior in College and got my first of 8 concussions in the second semester of my freshman year. The only way that I barely passed was with the kindness of my friends. They read a lot of my books out loud to me and my professors were lenient on tests. My GPA went down from a 3.8 to a 2.0, but I got through it. The big thing was explaining to each of my teachers what I was going through. They didn't let me off the hook, my diploma has to mean something, but they did give me a lot more time on things and were very available to help me after classes. Also, for my math class where we would randomly have to get up and present problems to the class my professor assigned my problems to me in advance so that I would have more time to study. Some days I could participate in class and other days I would leave in the middle because I was feeling so badly. I just had to communicate with the teachers and they were very understanding. With your daughter they can look at her grades from previous years and see that she has always had pretty good grades, so often they will give her the benefit of the doubt.
It is only a month more, so I am sure that she can push through it. It might be best to take a year off before college, if that is her plan, but it will really help.
As far as fitting into her dress if she can do less intense floor exercises or yoga that might help her to feel better as far as getting rid of energy. I know that for me I try to go to the gym 3 times a week. Some weeks it works and other weeks it just does not. Don't do any contact stuff, even jumping rope or running it too bouncy for my head at least.

For me the big thing was having goals. I had to have a reason to push myself and your daughter seems to have one: graduating with her class. She just has to realize that she might not have the best grades, but she can pass if you communicate with teachers and really focus on not doing anything to exacerbate the problem.

As a junior in college with one full year since my last concussion, I am now getting a 3.0. It has been a struggle to get it that high, but I have cut almost everything out of my life except school. I still relax by watching movies, or just talking with people, but dancing, hiking, horseback riding, soccer, all this is out. I even have to be careful watching my friends play soccer because my second concussion was from a kicked volleyball. But, life is good. I know what is most important to me and I am chasing it no matter how hard. It keeps me from the depression which often accompanies PCS.

My friends are also wonderful, they have adapted the way they have fun in order to include me, and I in turn find ways to exclude myself sometimes so that they will go hiking or dancing or out for a drink without me. Life can be good with just a little determination and a firm decision to get better despite cutting many things out of my life.

Good Luck, don't let her get a second concussion because that is when the long term trouble starts.

Margarite