How do I handle my 16 year old daughter?

You know that your daughter is a good person so I wouldn't stress on her at all. Many kids try pot to see what it is like just because that many kids in high school do it. Your main concern should see why your daughter is soo stressed out that she would resort to doing a drug. You should talk to her and see if there is anything you can do to help her. As for her friend you should allow them to have a second chance because people do make mistakes just supervise them more, as you were saying your daughter is a good girl so she probley will not make a bad choice like that again. Im going to tell you the truth high school is very overwhelming especially when you do a lot of other things like student council and sports. You really just need to talk to her!!