May Advise to a Granddaughter - letters exchanged by Queen Victoria and her Hessian namesake - princess Victoria? The Queen expresses her opinion on Russia Russians, the Romanovs and prospective marriages of Ella and Alexandra.
Julia Gelardi (I`m not sure about the English title because i read it in Poish: : "The Romanov Women: From Glory (?) to Revolution".
May be you should try interlibrary loan? Here in Poland I get books from Polish libraries for free and pay 10 euros for a book from any European country.... My university ibrary offers such a service, most university libraries do