During the First Balkan War, during the winter of 1912–1913, Joys volunteered at an Ottoman military hospital in Constantinople.
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Arntzen was awarded the King's Medal of Merit in gold in 1923 and the international Florence Nightingale Medal from the Red Cross in 1937.
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She thus became known as one of the first nurses to volunteer in a catastrophic setting abroad—already from her study days she had been an admirer of Florence Nightingale.
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