It may be too late, but you must keep trying, make sure she knows you realise you made a terrible mistake. If she won't speak to you, at least she knows you are still trying to contact her and haven't given up. You could also try writing her a letter, explaining how you feel and why you did what you did. But if you don't feel you are getting anywhere, then you must try to let go and let her get on with her life and you move on with yours. Good Luck.