Thats a right old pickle Christina, but theres not much you personally can do except be there to reassure her and be a friend whos there for her. Obviously the boy shouldn't be kicking off like he is, he needs some professional help to calm down. I suppose your friend is just trying to control everything but shes getting very worried about it all and probably just worrying that it wont stop.
But, just be there for her, try and stay in contact with her and ask if she is okay, listen to her more, I'm not really sure. But I'm sure you'll be there for her Christina so just do what you can as her friend