When you find your own strenght and your own worth you will not worry about her contacting again. Also you will stop caring about what us happening with her at all and live your on life
This is why selfwork is important, because the more you know about yourself and the more you focus on you the better your resistance will be to potential recycling attempts. Because you will not only see and know this person is bad for you but also _feel_ this. And feelings is what is keeping you thinking about this person.
Reading this forum and endless threads about how futile it is to recycle also helps with resistance to recycling.