The girls didn't have a British, nor an American accent. Hayley Mills was using the Mid-Atlantic English accent, or better known as the 'old movie star accent'. A lot of actors between the 1930's-1960's were trained in theatre or by their coaches to use this accent because it was pleasant to listen to and it made thir dialogue easier to understand with the primitive sound quality.
The accent was a mix of American and English which is why Americans today watch older movies and think that all of the actors have an English accent. The accent also became a sign of aristocracy since all of the actors were using it, it caught on to the politicians, wealthy people and business owners and it became a celebrity thing.
That explains why Hayley Mills had it since her father was an actor and her mom, being a playwright, was in the movie business as well. I think her dialect stands out more in the movie and is confusing, because this was made in the 60's and by then the accent was starting to disappear, so most of the other actors are just using their regular American accents.
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