Mom needed a new frame. This top tube sits 5" lower and has a more modern geometry than the automatic shifting "Landrider" that it is replacing. A steeper 69.5 head angle and a 30mm drop replacing the 67* HA and 13mm drop. A straight 1.125" steerer fork replacing the old 1" threaded.
I still might convince her to ditch the clunky shifting derailleur and just do a single speed in back and two gears up front. I noticed that she only really rides in the 16t in back and uses the 36t and 46t shifter up front for the few areas on the greenbelt with moderate hillsThe one-off dropouts required recessed areas for the hanger and its chainring bolt. I actually used a 1" hole saw in the mill to machine the surface of the hanger's recessed area and had pretty decent results.