totally depends. i'd ask for a few grand more off.
but since its untitled they will give the full warranty length (so 4 years and another 41k miles).
if you can save say $5-6k off a 320i or a 328i thats a pretty big chunk of the cost of it, and depending on how long you plan to keep it, its basically free money for a car that will still be titled as new.
i suppose my point is, if say she was going to lease the car, and they give her the discount and the lease is in the warranty period then take the discount.
even if she plans to keep it for say 5 years, and drives it just over the warranty, its likely even if there were "hard miles" on it it probably still wont matter
bmw's north american headquarters is in NJ and it was probably just some car for visiting execs to drive when they were in town. even the dealer loaner cars, i'd wager most people who are sane don't drive them particularly hard. not everyone is some car enthusiast hoon. i've had tons of loaner cars and really its not like they are loaning out M5's for loaner cars, if you already own a bmw you probably aren't driving a 320i loaner in some absurd fashion.