When explaining a character's actions, use key quotes or concepts from the text to support your answer. Mentioning 'Kitty' and the idea that "paper has more patience" strengthens the explanation.
Anne Frank maintained a diary because she felt lonely and believed she had no true friends with whom she could share her deepest thoughts and feelings. She famously wrote, "Paper has more patience than people." She wanted a confidant, a friend who would listen without judgment, so she named her diary 'Kitty' and poured her heart out to it.