Zhang Yadi, 23, also known as Tara, is supposed to be studying at a prestigious university in the UK.Instead she is believed to be in detention in China.In one of her last posts on the social media platform "X", she wished the Dalai Lama a happy 90th birthday. She had also helped edit an online Chinese language platform promoting Tibetan rights while studying in France.Her words of support for Tibetans, posted while abroad, are believed to have put her in prison. Beijing views the exiled spiritual leader as a separatist and what it calls the Tibet Autonomous Region, which it...