You say she likes the way the GT3 drives. Has she driven it or just been a passenger. There’s a difference, imo. I wouldn’t want to drive one to coffee and the gym. Too much work. The argument for the Carrera is it’s just more comfortable. You want a nice car for her to drive? Get a 997.2 Carrera GTS. And it’s a Pdk. To me that’s better for this application. I was a Pdk hater at first. But I got converted.
https://www.google.com/amp/s/www.caranddriver.com/amp/reviews/2011-porsche-911-carrera-gts-coupe-test-review
My guess is it will depreciate a similar amount to a gt3 over the same period. They are awesome cars.