Margaret later shed her child star image in 1958 by appearing on the cover of Life Magazine with the caption "The Girl's Grown", and was a mystery guest on the TV panel show What's My Line?.

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O’Brien, who became a major star in movies like “Journey for Margaret” (1942) and “Meet Me in St. Louis” (1944) spent six months training to play a ballet student in “The Unfinished ...

As Maxine O'Brien (her birth name), she first appeared in a civil defense film starring James Cagney, then in a bit in "Babes on Broadway" (both 1941).