A relative was driving their 2021 diesel SUV on Saturday to a family event on the N11. She had three kids and a disabled mother on board. She describes the car slipping while in gear and then hearing a crumpling sound. The car then lost all power and ultimately ended up on the hard shoulder. The road was extremely busy. It would not restart. The experience was terrible, particularly being stuck on a bend on such a busy road with high speed traffic in the heat. The garage are saying it’s a crank shaft total failure but that it is under warranty and will take a month to fix. She has lost all faith in the car and doesn’t want it back. What are her rights ?