I went to girlzone and one thing I could tell you is that it was an amazing experience. Your concern about the negative influence may be a legitimate one. But I would say that most of the influence would come from the other staff members. They come from all different back rounds and you may see a whole different world from your own depending on what kind of back round you yourself come from. I wouldn’t say that you may get influenced by the campers. You do have contact with the campers, there are activities that every staff member must be involved in. Each staff member is assigned one camper that you work with one on one. Overall I don’t think interacting with the campers would pose an issue. In fact it strengthens you cuz you learn to appreciate all the good you have in your life and that you are fully religious. There are many good sides to it. There is so much that you can gain. Shabbos is an amazing experience, you get to meet many different kinds of ppl., you see how young girls try so hard and even fight to be able to keep mitzvos, get closer to Hashem… and of course the fun and spirit 🙂 It truly is an experience!
If you have any other questions I would be happy to help you!