Many people, disgusted with their ugliness, went crazy for plastic surgery. In the end, in order to get their satisfied looks, they ruined their faces and became worse than before. They succeeded, but those were a few, with average looks, but they never thought about plastic surgery. They like themselves now, and they don't need to look too good.
You can tell her more about the failure of plastic surgery now and let her know how beautiful the original ecology is. Through the transformation the day after tomorrow, it is not as good as the original. Maybe you feel beautiful now, but in the future, you will know the disadvantages of plastic surgery. You can't see the difference now, but the disadvantages will be obvious later. Tell your sister to give her a lot of confidence, make her confident, and give up her idea of plastic surgery. If there is no way to eliminate it bit by bit, then take your time and slowly change your sister's mind.
Sometimes my sister doesn't agree with some practices and will persuade her. She may not be able to fully adopt them for a while, but she has the impression in her mind that she will think it over before doing it. Is it really good? Everything can't be done in one step. As time goes on, you will understand it slowly.