I still remember years ago (maybe more like 25) when my sister went shopping for a new car. She refused to buy from one dealership because the salesman talked to my dad instead of to her, even though she would be paying for the car.
That has always stuck in my mind because it amazed me that car salesmen would practically ignore women in the buying process. Fortunately, that has changed somewhat but maybe not on the service side.
That's why women are finding certified pre-owned cars more attractive for purchase consideration. They like the idea of buying reliable vehicles (so they don't have to visit the service department) and avoiding other hassles.
The biggest plus, I think, when compared to other used cars, especially for women, is the warranty that is good nationwide for repair work. That's something other used cars just can't offer.