The Little Police Officer and Her Headquarters

"Little police officer" sounds like a child participating in the police force's social activities, but our protagonist is suspected of being a little too old. As a female teenager, Olivia Smith was eager to become a police officer. She was often domestically abused by her father, a police officer, but she was also influenced by her father and wanted to be a police officer. One day, Olivia received a gift from a friend - a recorder. This recorder recorded many things. What was it? Well, I haven't decided yet