The Alberta woman who is being detained is Sarah McIver. She has been teaching in China for months.
The National Post reported that she was teaching at a school in China when she was detained due to visa complications and that arrangements were being made for her return to Canada.
A friend of Sarah said "The Chinese government could be reacting to Meng Wanzhou, the chief financial officer of tech giant Huawei's arrest by creating bureaucratic inconveniences for Canadians and includes cracking down on people who have overstayed their visas while awaiting their renewal. Canadians who study or do business in China may want to lie low and keep a low profile and avoid taking any risky activities because the political environment is just not conducive."