AITA for not paying for car repairs?

My 17 y/o kept begging for a car. She worked and saved up $4,000 to buy one. Before she purchased a car she was well aware that owning a car came with responsibilities such as keeping her grades up and having a job so she could pay for any repairs that may arise. Well, a month or so into having a car she quit her job/she was let go and her grades have been slipping. By quitting/let go, I mean she wasn't the best worker. I've spoken to some of her coworkers and they said she seemed lazy and isn't fast enough. She told me this afternoon that her brakes squeak when she presses on it, the steering wheel shakes and the check engine light is on. She's known for a month now that she would have to save up to replace the brakes. She's now "grounded" from her car and thinks I should pay for the repairs. AITA if I don't? I know she loves her car, but I can't see paying for her own repairs if she won't hold up her end of the bargain.