They said the car was found near Preston Road and the Dallas North Tollway---so kind of just a broad generalization of the area where it was found.
Preston Rd and The Dallas North Tollway run parallel to each other, with about 2 miles or so in between them. If her car was found on Preston, that would be close to her work, but if it was closer to the tollway, it would be more like 2+ miles in the other direction from Preston. Either way though, she didn't stay with the car for very long as far as distance is concerned.
I wonder why they didn't give a more exact location for where the car was found? You think they would have stated the exact location in case someone saw something suspicious.