I'm so sorry about your bird. It's always hard when a pet dies, I can relate. It might help to bury her in your backyard and make a gravestone for her. That way, you'll always remember Marie. That's what I did when my goldfish died (it lived for 5 years!).
The only thing you can do is go on with your life. You loved the bird, and I'm sure you defiantly took perfect care of, and it thanks you for the kindness. No need to get bent out of shape.