✔ 最佳答案
Sometimes there's no easy way to say it. In fact, as her friend you should really support her, even if you don't believe she can do it. She has got a singing teacher, maybe she'll improve. Try talking to her family, to see if they really think she can sing. Hopefully, they'll say no, and you can try to encourage them to tell your friend the truth.
However, if your friend asks you for your honest opinion, then you should be honest - tell her you don't think singing is her greatest talent and that she should spend more time on something else, maybe acting?