She was one of my favorite actresses. She could take a bad, maybe even racially-offensive role and spin it on its head so that all you saw was a tormented, tempestuous girl (Duel in the Sun). And no one could top her spinster school teacher portrayal (Good Morning, Miss Dove). She was always the best thing in every one of her movies, and that was the really sad thing, how she never got her transcendent movie, the Gone With the Wind moment which would have seared her in every movie-goers consciousness (ironically, she was married to David O Selznick). I wish she hadn't stopped acting in the 70s because she was one of the truly great actresses.
Here's a clip from The Song of Bernadette (she won an Oscar for her performance).