her parents are part of the neo-aristocrat class of society. turning down 50,000 means nothing to her, but she gets authenticity out of it somehow. you can simply look at the fact that Greta was given a new Tesla my Arnold Schwarzenegger, the manufacture of which is terrible for the environment, and accepted it. that 50,000 meanwhile could have been put towards negative carbon emissions.
And no, that's not an anti-EV argument, if someone is going to buy a car they're probably better than buying an ICE equivalent for the majority of people's driving habits. It's just a fact that manufacturing an EV emits tons of carbon.