Doe Network specifies that she was found on I-20, west of I-285, on the north side of the expressway. As I-285 is a loop/perimeter road around Atlanta, this could actually specify two different locations: one to the east, and the other to the west of the city, at the two places where I-285 intersects I-20. I suspect that they mean that she was found to the west of I-285 as a whole, which would be west of the city. If she was found on the north side, either location would indicate the eastbound lane. If west of the city, then she could have come from anywhere along I-20 going west all the way to Augusta and South Carolina, or from I-75 or I-85, both of which intersect I-20 in downtown Atlanta. In that case, she could really be from about anywhere.
Her NamUs specifies that basically all the clothing was found near her, while only a watch/bracelet and tennis shoes were found on her. It honestly may have been very difficult to determine any of that, as she was alive and taken by EMS--police may not have been involved at all at that point, and just have a pile of clothes that she had at the hospital or even just a report from EMS. I notice that none of them are photographed; they may well have been lost at some point in the process.
Perusing the Atlanta Journal on Newspapers.com reveals that there was
a large winter storm the previous week on January 7, with schools closed through at least Tuesday. The forecast for January 13 predicted clear skies, with lows in the low twenties that night, which is quite cool for the Atlanta area. I would think that most unhoused would go to a warming center or shelter if at all possible in those conditions. Even the amount of layers she was wearing would be inadequate for the temperature. Depending on when she was found Wednesday, the temperatures did rise into the 40s, melting much of the ice and snow that afternoon.