There are a few reasons why Anne might have written about Kitty:
* Companionship: Being confined to the Annex, Anne felt incredibly isolated and alone. Writing to Kitty gave her a sense of having someone to talk to and confide in. Kitty became her imaginary friend and confidante.
* Emotional release: The diary served as a safe space for Anne to express her thoughts, feelings, and experiences. Writing to Kitty allowed her to process her emotions and deal with the stressful situation she was in.
* Preserving her memories: Anne likely knew the risks of writing about her experiences during the war. She might have hoped that, someday, her diary would be found and her story would be told. This is why she gave Kitty a detailed and intimate account of her life in the Annex.
Essentially, Kitty was more than just a pen to Anne. She was a source of comfort, a friend, and a tool for self-expression during a very difficult time in her life.