I really don't see what she does as yellowface.
What is materially different today than a week ago? There was also another white girl that was acused by western ppl of cultural apropriation because she was wearing a traditiunal japanese kimono.
There do need to be people that are willing and able to sit people down and help them with the resources to better their worldview.
When stuff like this happens, the character assassination begins.
But to draw an obvious comparison, a racist is racist even if they grew up thinking racism is fine.
Because someone saw her come up recently and felt the need to bring it to light.