i've owned minivans with this exact drivetrain, and i bought them with over 100k on the clock. ran them another 100k without anything other than regular maintenance. granted, the buss's did not just sit around.
all of my minivans had trans-go shift kits installed, and when they died, it was because the bodies fell off the floor pans, not drivetrain issues.
what is the rest of the car like ? just because it has only 60k on the clock, doesn't mean squat if the undercarriage is all rusty, or it needs brakes and other general maintenance done.
in reality, how much longer will this lady drive ? it might just be better for her to update to something a little newer perhaps ?
pretty tough decisions to make. good luck with whatever you decide.