It's now confirmed to be Alison on the tracker map.
But you're right, it does seem to be beyond where she would be expected to turn off 6th Street if she was heading to her Aunt's house. Presumably she was either going somewhere else, or was taking a longer route for fun.
The location marked on the tracker map is accurate to where the image was taken; you can see the house at that location on Google maps. I've placed the tracker map image next to the Google street view:
View attachment 519205
Explore a place in a more immersive way in Google Maps.
www.google.com