Why did the producers only make winnie the shy nerdy girl in the pilot episode then made her more average in the other episodes ???

https://www.youtube.com/watch?v=n3eJkf4erbIhttps://www.youtube.com/watch?v=n3eJkf4erbIhttps://www.youtube.com/watch?v=n3eJkf4erbIhttps://www.youtube.com/watch?v=n3eJkf4erbIhttps://www.youtube.com/watch?v=n3eJkf4erbI

She wanted to change her appearance