My wife is the exact same way. Her vehicle is a mode of transportation to her. It better fit everything she needs to get into it (meaning kids, and kids' friends, etc), be extremely reliable, be comfortable, and convenient. She's picked out a couple of the cars we've bought her since we've been married (19+ yrs), but trusts my judgment completely.
As far as my vehicles... she doesn't care in the least. She almost never rides in them, and she doesn't drive a stickshift, so she only drives the trucks occasionally, and that's only if her vehicle is unavailable (a rarity). If I had a 10-car garage, she'd let me fill it... so long as we keep our house and have food on the table.