Cindy Williams was in one of the many Perry Mason TV movies.
Spoil alert.....she turned out to be the killer.
I can’t think offhand of anything else she has been in, aside from “American Graffiti” and of course “Laverne and Shirley.”
Laverne and Shirley was a Garry Marshall production. Marshall was big on having a small "family" in his shows. Cindy Williams had a falling out with Penny Marshall, who was Gary Marshall's sister. She got cut out of the series and that pretty much killed her career.
She was cute rather than hot, didn't age well, and was an okay comedic actress, but nothing special, so her exit from Laverne and Shirley was pretty much it.
American Graffiti was popular, but it never got the recognition it deserved. It was a major influence in storytelling and editing.