I just read the Biography on Princess Zinaida Yussupova by Greg King, and in a paragraph it says that P Zenaida Yussupova and GD Elizabeth Feodorovna were very close friends, and that closeness was still strong by the time GD Elizabeth Feodorvna was killed, "the worst blow came when she learned that her close friend Grand Duchess Elizabeth Feodorovna had also been murdered, thrown down an isolated mineshaft in Siberia along with six others with whom she had been imprisoned."
Now, reading the letters that P Yussupova wrote to her son Felix, there is one dated on December 11, 1916, where she writes
"I do not like the celebrated "sister" [the Grand Duchess Elizaveta Feodorovna Romanov]. In my opinion, she poses most impudently as a member of the family. She calls Irina by her Christian name, and evcn "Tata"! I strongly object to her behaviour. When I visit Irina I constantly find her there, lounging in a chair, without in the least understanding that her presence does not interest me. She sports a kind of operatic costume of a Sister of Mercy, and generally spoils the whole atmosphere by her presence. Irina seems to accept it all as inevitable, whereas I simply cannot stand it. You will see for yourself soon, when you come home. "
To me, it seems like P Yussupova couldn't stand GD Elizabeth Feodorovna and they were not friends (at least not anymore) by the time GD Elizabeth Feodorvna was killed.
So, Is the Biography incorrect??