There is no question that seat comfort (or more properly labelled "seat discomfort") is a major issue if the seats are uncomfortable. Comfortable seats are taken for granted, but if you end up with a vehicle with uncomfortable seats, it colors your entire thinking about the rest of the vehicle. I don't doubt this woman wants to be rid of the car ASAP.
We had a '04 RAV 4 for just less than a year, and the major issue in getting rid of it for the Highlander was the discomfort that both my wife and I found in the RAV, particularily the front passenger seat.
IMO, the best seats are found in German, Swedish and some NA cars, the worst in Japanese, excepting Subaru which seems to have good seats. It's also related to price, often the bottom end of the price range vehicles have the worst seats. Makes sense, I guess.
Agreed that as one ages, seat comfort becomes more important.