Ted:[1]
Joy was a graduate of Smith College, in Massachusetts, and before she died we made arrangements to give her correspondence with me, and a lot of her other personal papers, to the Sophia Smith Collection, a part of Smith College's library that collects materials recording the lives of women. Joy was a fairly remarkable person, so its possible that the Sophia Smith Collection might have her diaries.
Holly:[2]
a representative said it is not available to the public.
Finally, here's the website for the archive: The Sophia Smith Collection of Women's History