Eliza ended by acquiring an extremely uncommercial script which was a positive extension of her personal beauty, and spending three times as much on stationery as anyone else because certain qualities and shapes of paper became indispensable to her.
There are no more uses of "indispensable" in the play.
Show samples from other sources
Then a big pot was brought out as we raced to retrieve our indispensable spoons and bowls.
Leon Leyson -- The Boy on the Wooden Box
In fourteen years in Bluffton he had sired two sons and managed to worm his way so completely into Bennington’s life and make himself so indispensable that he sometimes seemed like Bennington’s third leg.