So what you can do now is to visit her at her grave often, tell her that you are doing well now, and you can go on by yourself, so that your mother can rest assured and come back to see you if you want, without any scruples.
You don't have to go to that world to communicate with your mother. Believe me, if you have something to say, just go to the grave or say it to your mother's photo, and she will certainly hear it. Let mom watch and listen by herself. Don't ask her questions, don't let her solve problems for you, and don't let her worry about you. Don't you believe in yourself and let her live that happy life?