How to deal with people asking you if you had nose surgery ㅠㅠ

I know a junior who has a good facial expression, and every time she sees me,
 she keeps saying, "You really have a pretty nose, sister."
 
It's a nose that goes well with any face. It's like who did you inherit it from? Haha. She doesn't hesitate to say rude things to me. At first, I just said thank you, but
 
I feel really bad because I feel like they keep asking me the same thing and leading me to interrogation;ㅠ How should I deal with it?
 
For your information, that junior is very talkative and if I tell him about the plastic surgery, everyone around me will talk about it, so even if I tell other people, I don't want to tell this friend ;ㅠ
 
My heart is so withdrawn that I can't be decisive and it's really embarrassing.ㅠㅠ