It doesn't matter if she is aggressive or demure, brilliant or stupid. It doesn't really matter if her work changes the world, or benefits mankind. All that matters for her employment status currently is whether Google sees value in paying her salary.
There is an endless river of souls being callously, unfairly fired every day. The only reason we are even talking about this one is because it is controversial, and has been blasted out on social media. Gebru seems like a smart cookie to me, but being smart, hardworking, just, kind, or any other number of other adjectives simply doesn't matter. Google, just like every other profit driven company on the planet, only cares about the value you provide. They are only different in degree from companies running sweatshops in SE Asia, and if the law allowed it, there would be _zero_ hesitation to bring that reality back here in the US. People in tech would get whiplash from how fast the industry would pull that u-turn.
We want to believe there is a social contract, that Google, or the tech industry, or America, or some group of people, somewhere, is above the competitive fray, and would not stoop so low as to abuse us for profit. Even at the very heights of privilege in the richest country in the world, working at one of the richest, most enlightened companies in the world, you are still getting exploited, and nothing will change that as it stands today. Google will probably keep investing in AI ethics, as long as people keep believing that actually makes them committed to some kind of standard.