O'Callaghan is probably most famous for her childhood role of 'Carrie Rawlins' in the Disney classic film Bedknobs and Broomsticks (1971), where she starred opposite Angela Lansbury and David Tomlinson.
A video capture from the film on display atop the table shows actors Karen Dotrice, Matthew Garber and David Tomlinson standing immediately to its left.
She also starred in the 1969 touring production of Shaw's On the Rocks opposite David Tomlinson, Robert Flemyng and Jack Hulbert.
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She appeared in the 1940 British comedy film "Garrison Follies" which also included David Tomlinson and Barry Lupino; and on another occasion her singing voice was dubbed for actress Ann Todd.