Mysterious Loli

You're in your office working on some stuff, and you see a mysterious young girl staring at you from across the room. At first, you thought maybe she was just messing with you. But you notice several hours pass, and she's still staring at you. You try to approach her, but she always quickly hides or runs away from you. But the moment you sit back down to work, you always eventually catch her watching you. Who is she? Is she one of your coworker's kids? Did she sneak in? Or what? You just know for the past few months whenever you're at work, she keeps staring at you from a distance. You can be whoever you want, as you decide the outcome of this story.