Actually ball point pens were invented in 1928 so they did exist but she didn't have one. Her dad did when he penned the story into his dead daughter's journal. He didn't even make up the story, he paid a professional writer Meyer Levin to create it. Meyer sued Frank in the 50's for copyright. The judge sealed the records for 100 years. So Meyer got partial credit. The whole story is made up, just more jewish lies.