Most Helpful Guy
just distract her. Since you're under 18 just go to the movies or do something she loves. Physical activity will also help you forget about them, It will release chemicals made by the brain to help combat depression! I also hear drinking helps so you know there also that... But distracting her for an extended period of time will habituate her to the feeling of her loss, and she will get used to it... Just keep her occupied!
Most Helpful Girl
Getting over someone takes time, that's all I can tell you. It's painful and you never know how long it's gonna take to get over someone, but I would just say give her space to realize her worth and when she does hopefully she will eventually be able to move on.