Before “Knots,” Joan signed a contract with Universal Studios and co-starred with Bette Davis in “The Judge and Jake Wyler,” a TV pilot that didn't get picked up. She appeared as a regular in sitcoms “Temperatures Rising” (1972-73) and “We've Got Each Other” (1977-78).
She guest-starred in TV series “The Six Million Dollar Man,” “Kojak,” “The Rockford Files,” and “Cannon,” among others, and starred in four episodes of “The Love Boat.”
Joan left “Knots” after the 13th season to star in “Spin Doctors,” an NBC sitcom. The pilot was aired but the show wasn't picked up.
Joan made her last appearance as Valene in 1997 in “Knots Landing: Back to the Cul-de-Sac.”
In 2001, she took a different type of role as Ima Cummings in the Howard Stern-produced “Baywatch” spoof “Son of a Beach.”