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Acting
Marilyn Sue Schreffler (June 14, 1945 – January 7, 1988) was an American voice actress who provided voice-overs for several animated television series, mostly for Hanna-Barbera Productions. Description above from the Wikipedia article Marilyn Schreffler, licensed under CC-BY-SA, full list of contributors on Wikipedia.

Scooby-Doo's Spookiest Tales
as (voice)

Scooby-Doo's Original Mysteries
as (voice) (archive footage)

Scooby-Doo and the Ghoul School
as Winnie Werewolf (voice)

Yogi Bear and the Magical Flight of the Spruce Goose
as Bernice (voice)

Fatal Attraction
as Party Guest

Popeye and Son
as Olive Oyl / Lizzie / Puggy (voice)

The Golden Child
as Kala (voice)

The Real Ghostbusters
as Spookums (voice)

The Flintstone Kids
as Rocky Ratrock / Flo Rubble

Heathcliff: The Movie
as Mr. Woodley's Secretary

Rose Petal Place: Real Friends
as (voice)

Starchaser: The Legend of Orin
as (voice)

Pole Position
as Kuma (voice)
Rose Petal Place
as Nastina

Airwolf
as Angie

Newhart

Simon & Simon

The Pink Panther in 'Pink at First Sight'
as (voice)

Yogi's First Christmas
as Snively Throckmorton (voice)

Captain Caveman and the Teen Angels
as Brenda Chance (voice)

Scooby Goes Hollywood
as Cherie / Sis / Receptionist (voice)

Casper's Halloween Special
as Winifred the Witch (voice)

Scooby-Doo and Scrappy-Doo
as Amelia Parmer

Fred and Barney Meet The Thing

The Popeye Valentine Special: Sweethearts at Sea
as Olive Oyl / The Sea Hag (voice)

Buford and the Galloping Ghost

Yogi's Space Race

The All-New Popeye Hour
as Olive Oyl / Sea Hag / Swee'Pea

Scooby's All-Stars
as Brenda Chance / Daisy Mayhem (voice)