On 21 September 1942 Anne wrote a short note to Jettje in her diary. A little further on, she wrote another one to Emmy. One day later, on September 22, she wrote to Kitty: ‘Dear Kitty...I like writing to you most, you know that don’t you, and I hope the feeling is mutual’. Yet she still wrote to Pop, Jackie, Marianne, Conny, and other girls.
She had invented most of these names, but not all of them. Jackie was Jacqueline, one of her best friends. To her sorrow, Anne had not had a chance to say goodbye to her before going into hiding. Kitty was not made up either. She was a character from the books about Joop ter Heul, written by Cissy van Marxveldt. Anne was very fond of this series. She described Kitty as 'a nice 14-year-old girl' and said that they were becoming ‘the best of friends’.