She's 15. Sounds like a good age for her to start figuring out how to be self-reliant & take responsibility for her own transportation/life obligations.
Your job is to raise a responsible, resourceful, thinking tiny human, right?
My son is 17, (18 in a month) and gets in 15-20 miles per day on his bicycle to do all his daily errands. It started in 9th grade (age 13) & he sees no need for a car whatsoever.
He also uses the bus regularly & walks when his cycling legs are tired.
If she is bent on externalizing the cost of het responsibilities to you, Dad, maybe it would be a reasonable compromise to spring for a bus pass & tie it to your checking account or a fancy new bicycle (even an electric one) & save yourself the hassle, expense, & obligation of being somebody on-call taxi service.
Don't let yourself be used on account of "love" You'll be a doormat, unappreciated & taken for granted every time.
20190601_193336 by
Richard Mozzarella, on Flickr
Here is my sons bike. Cannondale H300 shortly after it's second complete overhaul. Notice the milk-crate, the low-rider rack, the fresh powder-coat, Nuvinci N380 hub with XT hollowtech 2 crankset & abarasque Shimano 600 chain tensioner. The second rebuild was done with about 50% his money & my fatherly expertise. The experience sense of ownership and collaboration between father/son alone is worth more than a car could ever offer.