Thank you all for your helpful advice, I think the best thing would be to try to get a court order to stop her, I have been considering changing my name too, surely there's no way she could find me if I have a new name???
Police said if I make a full statement about the abuse she subjected me to it would give them more power to stop her contacting me. The only problem with doing that is they will question family members if they suspected /saw the sexual abuse take place but none of them witnessed it, she only ever done it when I was alone with her. I was a very shy, quiet girl but that doesn't prove anything. I have no evidence except the psychological damage she caused.