In the unlikely event of anything going wrong, she will get in touch. You cannot keep them locked up and also expect them to grow up. Each age has its interest and its ups and downs. Would you want a child for ever? The only way you can do that is to have one baby after another for a long, long time or not have children at all. Hope she has had a fab time!
My mum always said that if we didn't call from camp/holidays or whatever it was a good sign. If something would be wrong, she or one of her friends would call you. As long as it's quiet you know she is alright.
Oh and I usually called my mum twice from camp, once in the beginning of the three weeks, saying that we arrived safely, and once at the end, to tell her when exactly to pick me up. Only once I clled more often, and that was when I was terribly homesick. So the rule stands, kids call when they do not feel well.
My just 11 year old DS is away with scouting to Croatia for 2 weeks this summer.......... No phones allowed. They do run a blog though so we can keep track of their activities etc. We thought it would do him the world of good in terms of becoming a bit more self sufficient before going to secondary school. I'm convinced he will LOVE it and will possibly not give the home front a second thought. As for me.......... grow up mother,grow up because there's nothing gonna stop them doing it.