How did the only daughter of Claude Debussy die?

Claude Emma Debussy was born on October 30th 1905. Debussy was very fond of her, and tragicly she outlived her father by scarcely a year, dying in the Spring of 1919 of Diptheria poisoning. If only she could have lived to see the marvellous consequences of her fathers work. She is buried with her mother and father in Paris. May she rest in peace.