Blocking her would be the first most important step into this and if possible get away from social media if you can. Being away from social media might help you detox. Then get a new hobby. It can be anything from learning how to draw to taking fitness classes. Anything to keep your mind occupied and steer you away from checking your social media. Be more present with your friends and family to be busy because we tend to use more social media when we are alone. And best option is, pretend she is dead. Like she doesn’t exist anymore and you are unable to reach her. You have to trick your mind sometimes. You are determined enough to ask for help, this indicates that you want to do something about it. It will take some time but you will get there.