I'm so sorry it must have been really hard, but it sounds like you did the very best for her, and as you said at least she went peacefully and had someone who she loved and trusted with her.
There isn't anything I can say to make you feel better but I just wanted to let you know that I (and probably everyone here) really feels for you, people who don't have pets just don't know what it is like to loose a fury member of the family!