Sorry if this has been discussed, but I thought Roberta Maxwell did a super job as Mrs. Twist. In the limited time she was on screen, she gave a powerful performance. Her entire life was spelled out in her face and expressions like a road map. The subtle looks and gestures conveyed so much, plus she was probably the most non-judgmental character in the movie and the most "Christian."
Ironically, I've only seen her in one other film, "Philadelphia," in which she had an even smaller part.