I love playing with you people, but it just makes me tired when everybody argues.
It's a CAR, for pity's sake. It will get her from point A to point B for a few years. Then she'll decide if she wants to keep it forever because she LOVES it, trade it in on another one if she really likes it, or get rid of it altogether if it turns out to be not all that she wanted. She just wanted to know what was good or bad about it. My guess is that she already had an idea that she wanted a Prius, but wanted either a validation for it or a strong warning against it.
Do they require special $5000 tires every 6 months? Does she need an extra 150-mile extension cord, just in case? Since they're electric, will they explode in the rain? These are the sort of things she wants to know; she seems to understand what she likes about them already.
Maybe she DOES want good gas mileage for the instant gratification of saving on the weekly bill, which will negate the hassle/expense of whatever battery issue it has. THAT'S OKAY. Maybe it will make her feel good that she's making an honest effort not to consume an inordinate amount of fossil fuel. That's great, too. Nobody needs to bust her chops about it!
Maybe status (whether social or economic or environmental) is playing a part. That's okay, too, dadgummit. Anecdote: I was shopping for a Civic because they're great cars. Then I found out that a convertible MINI had comparable gas mileage/resale, better maintenance, etc. Mostly I bought the MINI because it was--don't judge me!--CUTER! (I also recently discovered that you can fit a giant surfboard in it, too, and I doubt I could have done that in the Civic. I would strongly recommend a MINI, but the backseat is strictly for people who don't have legs. I never sit in the backseat when I drive, so I don't care.)
If she's gonna spend the money, she might as well spend it on a car she likes. If she wants a frickin' Prius, let's love her for it! Buy the Prius, honey!
Can't we all just get along?