I've told her stop but keeps going can any legal actions be taken
You’ll have to get a court order prohibiting that person from calling you and then if she violates that court order she can be arrested. If you have an answering machine and the caller leaves harassing or annoying messages that would probably be enough for the police to talk to her. You can also put a caller block on your phone or change your telephone number.
If a person keeps on calling you against your will, and won't stop even though you have requested that he/she stop, it is possible that you could obtain a restraining order preventing further calls. This would especially be true if the telephone calls were such that you felt reason to fear for your safety. If you did obtain a restraining order, and the person against whom the order was issued violated the restraining order, you could then call the police and the police would arrest that person. However, obtaining the restraining order would not be automatic. You would need to consult with an attorney regarding the nature of the phone calls to see if you had a legitimate chance of obtaining a restraining order. Good luck.