Just to play devils advecate, I don’t know anything about her life.
Its safe to assume that BJJ has been the main focus in her life for a long time. Knowing that most of the people she trains with speak Portuguese: we can assume that they are also her friends outside the gym, maybe talking on the phone or hanging out in person, going to tournaments every weekend, traveling together, etc. she also lived in Brazil for many years.
I immigrated to the US when I was 6 years old. From Russia to Brooklyn. I can still speak Russian fluently but as I spoke less of it over the years the accent thickened. I only maintain the ability to speak it because I always took every chance to speak it as a lesson or practice.
Her Portuguese sounds pretty good and she lived there for a while. Is it hard to assume that she regressed with English and evolved more into Portuguese naturally and not by some coy to fit in with the cool kids?
I think this thing escalated pretty quickly without any solid proof of anything. Everyone who knows her speaks well of her, the Brazilian people love her. Why is she getting hate?