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It's a brief but instructive passage from her memoir, A Life on Film, about playing yet another mother in the first remake of Little Women (1949):

My approach to the part of Marmee was not an enthusiastic one... the girls all giggled and chattered and made a game of every scene. [Elizabeth] Taylor was engaged, and in love, and talking on the telephone most of the time (which is fine normally, but not when that production clock is ticking away the company's money). June Allyson chewed gum constantly and irritatingly, and Maggie O'Brien looked at me as though she were planning something very unpleasant.

Yes. Exactly so. Margaret O'Brien was a brat and June Allyson was dumb as a bag of hammers. It's funny because it's TRUE.

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Clockwise from bottom: Bratty, Sweetie, Dummy, Nymphy, and Classy