Erin Moran was an adorable child. Are we talking about the same person?
Go back and look at her in the first 5 years of Happy Days. She is not pretty at all. But then she grew into her face and she developed a body. And everything change.
try this:
https://s-media-cache-ak0.pinimg.com/236x/15/4c/55/154c551f51612999373ed2c082ee0c53.jpg