Wasn't Hermione Baddeley terrifically worthy for her 3 minutes?
For a performance that clocked in at under 3 minutes, she wasn't merely Best Supporting Actress category filler. She made an impact and deserved her nomination!
That said, usually the actors who get nominated for such little screen time truly deserve it (quality, not quantity). But then there WAS some filler in the '50s, like Mercedes McCambridge in Giant.