I checked her Wikipedia, looks like she's an Australian (blurb in China but eventually revoked her citizenship) journalist who reported on Xinjiang in early 2020. It cited this WaPo article, which has a couple bits I thought were pretty important:

“As someone who analyzes propaganda activities for a job I can see it’s clearly a coordinated attack,” she said. “At this point, the Chinese government has made it abundantly clear that if you want to keep talking about Xinjiang, the Chinese state would not treat you nicely.”

The online onslaught against Xu, named in countless headlines as the unexpected “black hand” behind the West’s anti-China campaign, has continued with tacit if not outright support from Chinese state media.

Not relevant but worth a laugh:

Jo Smith Finley, who researches Uyghur identity at Newcastle University in Britain, said the sanctions mean she cannot stay in touch with contacts in China, where she has been traveling for more than three decades.

“My friends in Beijing are some of my oldest and dearest soul mates,” she said, describing adrenaline-filled days after the suppression of pro-democracy protests in Beijing in 1989.

“The thought of no longer being able to sit in Beijing cafes and restaurants with them and set the world to rights is just unthinkable, surreal,” she said.