I'm so sorry you and she had to go through this. You did the right thing though, hard as it was. It takes a lot to realize what is right and then actually do it, don't be too hard on yourself.
I have a gecko who has had a few (three that I know of) internal bleeds, she is wobbly now due to, I believe, brain damage from the lack of blood flow. I worry about her daily but, for right now, she is doing OK. The day will come when I may be faced with a similar decision, I only hope I can be as strong as you were...