Why not simple?

She was angry at everyone after the death in a car accident of her beloved racer, who gave her a love of racing and a goal in life to become a racer too. She believes that his death was staged and does not listen to anyone, that it was just an accident.
She wants to participate in the races herself to show everyone that his spirit lives in her and is determined to win.

Because of her bitterness, she has almost no friends, mostly acquaintances.

I hope that the translator has translated everything correctly