It is good to cry, my dear. This is very very sad and your warm, caring, loving side show though so vividly here. So please don't misunderstand what I am about to say.
Circumstance is what kept you from being there the night of the accident. Fate can deal some pretty hard blows at times. Even still, you had now way knowing what had happened so please, please don't beat yourself up for "not" being there. Your heart has always held the friendship special, and from where you were, what else could be done?
You were able to share you beautiful emotion with your friend last night, even if under less than desirable circumstance. Some never get that chance. By all means be sad for her, but also be joyous she is alive and still your friend. Most of all, do not carry ANY guilt from this. And if I've said too much just slap me! I am speaking from experience here, though.