I don't see how this can be unless she gave her phone # or something else equally as definitive. Using n IP Locator only turns up very general info such as the area and in my case even the town was wrong. The geographical center of the place I was in was a full 7 miles from where I am and that includes a lot of people. The only thing I can think of is if there is an instrument that can pick up IP address from the street and id the user that way. Can that be done?
They pieced together isolated innocuous bits of information she had given out over the years. The internet is amazingly powerful. Haven't you ever watched CSI?