There is no mall in Delphi.
I didn't see anything resembling a mall. As I tried to depict in that photo album of Delphi, the Carroll County Courthouse building frames downtown and dictates the area. Local businesses are across the street on all sides. The courthouse lawn has a theme on each quadrant. The Pizza King favored by Abby and Libby is smack across the street on the gazebo quadrant.
Toward the east just down the block are the fire station plus the Delphi library. Also lots of local eateries.
In the other direction (west) just beyond the courthouse you have the name brand chains...Shell station, Sunoco station, McDonald's, CVS, Dollar General, auto parts store. Then just beyond that down a slight hill are the Dairy Queen and Pizza Hut across the street from each other at a rather busy intersection that basically brings people in and out of town on that side. The Dairy Queen is 4/10 mile from the courthouse.
I thought it was a decent allotment for a town of that size. I drive extensively. I see small towns boarded up and going out of business all over the country. That was not true of Delphi at all.
But I've always lived in major urban areas or their suburbs. I never faced teenage life in a small rural town. Things like Canal Park looked very interesting to me. Probably not for a 13 year old who has already been there more times than desired.
I was staying in Monticello, about 15 miles north. It looks like that area is being developed on speculation. There was a brand new huge hospital with a massive parking lot. It seemed out of place given the population. Likewise an obviously new Walmart that had the fewest amount of shoppers I've ever seen at prime time Saturday night for a Walmart during perfect weather.
I don't know the dynamics of that area but I wouldn't be surprised if Delphi doesn't grow partially because people move closer to Monticello if they can.