(((((((( ))))))))))))
I don't know Jen. You were there for her and walked outside with her everytime the alarm went off. You comforted her and talked to her. What more could you have done? I think you did all of what you could do. The rest is up to her 'cause she probably could either have an emergency stash of low dosage tranquilizers on hand for when this happens or she could go to therapy, if she's not already.
((((((((Jenn)))))))))
I hope she's okay. I think you were a kind and caring friend to her.