You are NOT letting go, plain and simple. As long as you continue to go into her email accounts and such you are giving her a tremendous power over you. Maybe she just didn't think you would do something so low! Maybe she is so busy trying to do what she needs to do to sort herself out that she isn't wasting time on things like that.
That is exactly where you should be. Let go, concentrate on YOUR stuff. You have WAAAAAY too much time on your hands if you have time to do that, and right now, you need to occupy your time and thoughts with lots of other stuff. Every time you think of her you need to do something else. Go out, go for a walk, go swimming, call a buddy, study, whatever you can to get over the thought. It's like an addiction. The need will gradually lessen. But you have to do your part.