How can I help my shy teenage daughter be more confident?
Help her to become more confident by doing everything that you can to strengthen your relationship with her. The closer you are, the more effectively you can influence her. Her self-confidence will grow when she feels valued for who she isby you and those around her.
Try to understand what's special and different about her. Help her inventory her strengths, and don't try to make her fit whatever mold you might have in mind. She will grow to be her own unique and wonderful self.