In that connection, in the preface of "Japanese Girls and Women," she had written this sentence ‛to my lifelong friend, Sutematsu Oyama' and she had been exchanging letters with Sutematsu until just before she died.
ちなみに『日本の女性』の前書きには「生涯の友人・大山捨松に捧げる」という一文が添えられ、捨松とは死ぬ直前まで文通を交わしていた。