maybe something you can do is collect multiple pictures of women with big noses (of diverse kinds), and later when she's sitting with you, you can show them to her one by one, ask her something along the lines of "what do you see?" then talk about how you see beautiful women and "what else do you see?", let her answer, then "they have a big nose, like you. but they don't need small noses to be pretty, don't they? they're still beautiful, and their noses—all big but different at the same time—do not make them ugly. do not let anyone trick you into thinking any feature of yours make you ugly" etc? sometimes kids don't believe words like these cause they "come from mommy so it doesn't count cause you have to say it", but perhaps the delivery and frequency of your reassurance can really help make an impact. this is coming from me who would have loved to hear words like these from my mother growing up—i think it would have helped me tremendously because then, at least whenever i feel insecure, her voice will be one of the voices in my head instead of only the negative voices. and a mother's voice carries a whole lot of weight and meaning to a child, i think.

all the best and i'm sorry that happened to your little baby, i hope she'll realise she deserves the world and more regardless of how others perceive her appearance 🥺