What should I do with my fiancée who plucks her eyebrows despite my warning her, claiming that it makes her look bad according to her relatives?

Previously, evidence for the prohibition of plucking eyebrows (namṣ) was presented. An exception to this is when the hair is excessively thick to the point of disfiguring one's appearance; in such cases, it is permissible to remove the amount that eliminates the disfigurement. You must explain to your fiancée the scholarly opinions on this matter, while also noting that a fiancé, before the marriage contract, is a non-mahram (definition) to his fiancée, and engagement is merely a promise of marriage that can be revoked.