In the play, her name was Mrs. Muller.
In the film, her name was Mrs. Miller.
Probably to make her character more accessible to the "mindless" American movie audience as you so candidly posted about the film months before you had seen it.
https://forum.broadwayworld.com/readmessage.cfm?boardid=1&boardname=bway&thread=986779#3738967
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