She is upset and it probably made her feel better to give it to you. But that doesnt mean it was right. You have to everything to let this go, and not try to get her back. As mad as you may be. I know from experience, I drifted away from a friend of ten years. I think about our friendship all the time, and it has been two years. But things are better now that we are apart. Try to let it go.
You're right, though. I just need to let it go. :]