I went down a Smurfette rabbit hole since I remembered her as initially evil & then converted to good... Came along this:
"Smurfette was made in the wizard Gargamel's laboratory. She was created by a magical potion. Her list of ingredients include: "Sugar and spice but nothing nice...A dram of crocodile tears...A peck of bird brain...The tip of an adder's tongue...Half a pack of lies, white, of course...The slyness of a cat...The vanity of a peacock...The chatter of a magpie...The guile of a vixen and the disposition of a shrew...And of course the hardest stone for her heart...."
"Smurfette is discovered by a single Smurf in the forest, wailing to herself and lamenting her unhappy lot in life. She explains to the Smurf that unless she is rescued, she will surely perish.
Smurfette is a brunette with straight, stringy hair, ugly eyelashes, a plain dress and large plain shoes."
"Papa Smurf is the Smurf who turned everything around for Smurfette.
After a successful operation of "plastic smurfery", Papa Smurf transformed the ugly (and unhappy) brunette Smurfette into the blond bombshell she is today."
"The Smurfs were very pleased with the new and improved Smurfette. The truth was eventually revealed to Papa Smurf and the others that Gargamel created the first incarnation of Smurfette, but her improved disposition and appearance helped the Smurfs accept Smurfette as one of their own."
It does seem Keith was somewhat right... She was good at "woman-ing"
Smurfette Was Created in Gargamel's Laboratory: The History of Smurfette - BlueBuddies.com