I've said this many times and I'll say it again:
"The only way to overcome a fear is to face it."
If she's still calling you, then you need to find out where she lives and pay her a visit. Don't do it alone though, bring someone with you. If you can't figure out where she lives, then get the police involved...
You just can't let a fear keep 'frightening' you your whole life - someday you will have to take action in order to end that fear.