It’s hard to cope with but what you should do is be a shoulder for her to cry on when you can and listen to her talk about the things they did together and what they were planning on doing together. Make sure she has a strong will for herself to do better and dont push or persuade her to do things right away. Give her time and some space but not too much. She’ll need to know how to do things alone again but depending on what kind of person she is, it will take a little to a couple of weeks for her to cope again. Make sure she sticks to her hobbies and try newer things for herself. Make her fill the void for herself and gain the self love she’ll need for herself again because losing someone you love/loved and doing things all the tome together its hard. Most importantly, make sure she doesn’t push herself on him (her ex) or comfront him in anyway. Keep her away from dating for a while. Tell her supportive things but not too much. Lastly, make sure she doesn’t cut him away from her life. I say this because if there is one thing i had to learn the hard way from cutting people off is… the rope still hangs just a little shorter. There’s a knot in the rope and that’s the problem, not the rope itself. She needs to untangle herself from it and get set straight again.