...having been a 13-year-old girl once, I can assure you that that padlocked diary is more likely to contain a revenge list, a 'why am I so fat?' rant at least once a month and possibly the plans of a bank heist. If there are little hearts, they will often have devil horns on them, and knives and arrows sticking out with big blood drops.
Tween girls are dangerous, tbh.