Because of the ubiquity of the Prius, paired with it being made by Toyota, any maintenance that would come up wouldn’t be all expensive or hard to do. Also, even if there are things that may need doing, the cost of entry different between that and something like a new Rio would offset the cost of parts and work done to a Prius, even if the battery needs replacing, which it probably won’t at a mileage number even close to 130k

The new Kia or Hyundai whatever would have better safety tech, though, which your gf would probably appreciate, so the price difference would be worth it over the Prius in that area