I figure at that age they are adults. If you trust her let her be an adult. If you think she is doing something wrong, then talk to her about your concerns. I always tell my kids that I trust them until they give me a reason not to, once I have a reason not to, things around here will change... they know I mean it, so they tend to toe the line and not mess up their freedom...so far I have never had a single problem with them, they are good solid people with a healthy self esteem for themselves and they respect others. My 16 year old daughter has friends that are under tight control from their parents and they are the ones sneaking around and getting into trouble.
If your daughter is a good person with a good head on her shoulders then kudos to you for having done a good job in raising her.
If your daughter is a good person with a good head on her shoulders then kudos to you for having done a good job in raising her.