I guess my question would be why are you changing your name? Is because you don't want her to be able to find you or because you hope it will be cathartic to healing? In any event it's ultimately your decision. I can see that changing your name may be representative that you starting a new, but it won't be a magic fix (not that you assume so just felt it important to point it out), kind of like some people think getting a tattoo and then they regret it. I hear it can be frustrating because friends and family you would like to have in your life will have a very hard time locating you. Just food for thought. I hope you the best.