S.H.
Dear K.--I don't have any suggestions about what to send to your daughter, but I do have words of comfort for YOU. My autistic son was 13 or 14 before I was able to work up the courage to send him to camp. So-congratulations on being able to do this sooner!
I can definitely identify with your fear. I was convinced that the camp was going to "lose" my son and that I'd never see him again. While he was there, I would cry and go into his room to lay on his bed and cry some more. (Sounds really silly to me as I write it now, but I was comfortless at the time.)
What I want to tell you is that you're doing the right thing. Your daughter will probably have a wonderful time and be thrilled at the idea of going next year. We have never failed to let our son go to camp since the first experience. He had so much fun, and that was what we wanted.
He is now 26 and is living at home again after an 8-month stay at a group home. (Now THAT was HARD!!!) After his state funding changed, he had to come home. Our plans now are to work with him until he's more independent, and then try the group home again. It will be hard for us, but necessary for him as we get older and less able to care for him.
Hang in there, K.! You'll have your daughter home after a week, and she'll have all kinds of wonderful stories to tell you of the fun she had.