Judging by her Twitter, she strikes me as a dev on the edge of burnout. Anyone who fights that hard on Twitter is going to be just as volatile and voluble in the workplace. No reflection on her talent, or the validity of her creative vision, but in game-dev its easy for your passion to become a rope around your neck. You get punchy - I know this from experience - from the endless battle to make (what you feel to be) the right choices. Friction is part and parcel of the dynamic, and it can wear on you and the people around you.
Objectively, you can't admit to this (burnout). It really is the kiss of death in the industry, which might explain her unapologetic stance in the face of clear evidence that she mishandled her interactions on Twitter.
I'm not saying she was/is right, just giving my 10c as somebody with a lot of experience in the field reading between the lines.