I think it's a great idea.
1. My own girls' camp experiences were pretty rough n tumble. We had very strict rules about what we could and could not bring and we could only bring the bare necessities, junk food, and stuff with which to make fun crafts. There was no room for looking cute or wearing lots of jewelry.
2. I worked as a counselor at a Boy Scout camp that was also used for LDS girls' camps. It was even more rough n tumble than the ones I experienced.
3. Girls' camp has many spiritual moments. I do not believe body piercings severely affect one's spirituality, but there is something to be said for humbling one's self and taking part in the group mentality. I think the less-jewely approach is sensible especially for backwoods' camps and therefore there might be problems from the girl who wants to rebel.
When you get to heaven, do not stop and stare. Chances are there'll be others surprised to see you there.