She has a wealth of 123 credits on imdb. (In comparison, Katharine Hepburn has only 52.) A few of the awards she won are two Oscars, a Golden Globe, an Emmy and an American Film Institute Lifetime Achievement Award.
Among her iconic performances are Mildred in Of Human Bondage, Leslie in The Letter (my favorite performance) Margo in All About Eve and Jane in Whatever Happened to Baby Jane?
She is always a pleasure to watch and makes any movie better. I recently recorded Bordertown and look forward to watching it again.