Of course you do understand that she was created by Gargamel to trick & betray the Smurfs, all male up to that time. She was at first an awkward homely thing, but the patriarch remade her as a raving beauty.



In the end, altho she had switched from helping Gargamel to working against him, she realized she was turning the Smurfs into boobies by distracting them, etc., so she left to an unknown fate. She was NOT a new addition by any means. Papa Smurf then built an artificial human to annoy Gargamel.