Countless girls 10-14 upload their recordings to YouTube (though perhaps not many from Afghanistan). If you find something you like, you can post a "comment" asking for permission. Google-translate can be helpful, also for search keywords.

Girls' choirs abound as well, and most of them deserve being promoted.

As for encourage girls to stay in school - don't be too demanding in terms of good intent and authenticity. Most youngsters appreciate a good education but are not too anxious to preach to their peers, unless shoved by adults.