Tsui's participation as a part of extinction rebellion was for making short movies. The movies are about how climate change affects particular species. The movies are made for Extinction Rebellion's social media. This led her to be called by creative director of Stella McCartney to be part of their campaign. In April 2019, two girls from the campaign's team met her in Extinction Rebellion's event in London. She was interviewed by them about her involvement in Climate activism. She became a part of the advertising campaign named ‘Agents of Change’ as one of activist. Examples include Jane Goddall, Deya Ward and Ruby Munslow. The campaigns are also accompanied by models like Amber Valletta, Chu Wong, Trinity Hill and Chloe Pearson.