What if my daughter is rude to strangers? I pretended to mix society on QQ, saying I was playing with friends, but it wasn't.

Teenage? In the rebellious period, what she said was at best a child playing house, and after addiction, she would be fine. Don't be beaten, let alone say no, otherwise it will be counterproductive.

Don't talk to her with obvious purpose, just talk casually, and let her treat you as a "friend" and tell you the truth.

At my age, too many girls were willing to talk to me because I didn't have any purpose. After chatting, we consolidated our friendship and helped her clear her heart.