You're referring to the infamous "Emily's Diary" series!
My name is Emily, and I hate writing introductions. Mrs. Alvarez says a diary is a "dialogue with the self." That sounds exhausting. Mostly, I just need somewhere to put the noise. emily%27s diary - chapter 1
In the margin she sketched a square window and a small vase of flowers. Her handwriting grew steadier as she listed tiny actions that felt possible: You're referring to the infamous "Emily's Diary" series