Sooo.......... who's car is it? Yours or hers?
If you're not married then she has NO say so on what you buy. The woman that I was dating at the time told me "If you buy the Z over that BMW that I like more then it could be a deal breaker between us". I bought the Z and she went out the door.
Buy the car with the options that makes you happy and can afford and don't appease others in that decision. You're the one who has to drive and pay for it.