This Girl talks to me like a Child/Pet

Im 16f and she’s the same. You know those TikTok videos where it’s someone pretending they’re the popular girl and they’re talking to the quiet person like they’re a pet or child with an annoying ton of voice. Yeah that’s what I’m experiencing except she isn’t popular and nobody in class really talks to her because she just talk behind everybody and all her past friends hate her. Her insecure ass is now targeting me because I can’t really speak well (Im in Korea but my Korean isn’t the best). I went to middle school with her never in the same class but I was friends with one of her friend and well I got the vibe she didn’t really like me. You could say that’s not too bad and yeah I would think that too if she wasn’t getting close to my best friend I would be over worrying but she did the same thing with my past best friend which she also talked behind other people’s back with. What should I do the next time she talks to me?